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Boston Marathon explosions

At least two explosions occurred near the finish line of the Boston Marathon on April 15, killing at least three and injuring more than 170.

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Cambridge, Mass. (CNN) – The first image the nation saw of the two brothers may serve as more than a pivotal clue to investigators in the Boston Marathon bombings. It is, perhaps, a snapshot of their relationship: One leads, the other follows.

That’s how some friends remember the Tsarnaev brothers: At 26, Tamerlan was seven years older than his brother Dzhokhar, who followed his big brother around like a puppy.

And with their father in Russia, the older brother may have become a father figure to the 19-year-old these past few months. At 6-feet-3, Tamerlan was, by many accounts, an intimidating presence with increasingly strong convictions about society and religion in recent years.

FBIBut the picture that is emerging of the now infamous brothers is also fuzzy — just like the surveillance video.

An investigator who studied their video images after the bombings said the two brothers “acted differently than everyone else” — they stuck around and watched the carnage unfold, and walked away “pretty casually.”

Aquaintances of the brothers, now dredging their memories, find themselves short on clues. Many say both were likable and well-loved in their neighborhood, not loners driven away by society.

The casual air of the brothers seemed to mean nothing before Monday, April 15.

For more on this CNN story, click here.

BOSTON — A Boston officer shot and wounded in pursuit of the marathon bombing suspects last week had to be resuscitated after his heart stopped and he lost his entire blood supply, but doctors and relatives on Sunday said he was emerging from sedation and expected to recover.

Massachusetts Bay Transportation Authority Officer Richard “Dick” Donohue Jr., 33, of Woburn, Mass., had served with the department for three years when he responded to a call Friday for assistance after a shooting at the Massachusetts Institute of Technology in Cambridge, officials said. They said it was not clear whether Donohue knew at the time that the MIT officer who had been shot and killed was a friend of his, Sean Collier.

Donohue emerged from his police car and exchanged fire with the suspects before he was shot in the right thigh, officials said. A bullet severed his femoral vein and artery, and Donohue began to bleed out, doctors said.

“CPR was started in the field, and he required a prolonged resuscitation that started at the scene and at our emergency room,” said Dr. David Miller, a critical care doctor at Mt. Auburn Hospital in Cambridge, during a Sunday briefing at the hospital.

boston suspect caught

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Donohue had lost all of his own blood, but doctors were able to give him transfusions to replace it. Miller said a surgical team was then able to stop the bleeding and save Donohue’s leg. The officer remained in the ICU Sunday on a ventilator, in stable but critical condition and unable to talk, although he wiggled his toes and squeezed fingers.

“He continues to need high levels of sedation,” Miller said.

He said doctors were “cautiously optimistic” that Donohue would make a full recovery.

For more on this LA Times story, click here.

BOSTON — The surviving suspect in the Boston Marathon bombings remained under heavy guard in a hospital Saturday, with an injury to his neck complicating how he would be interrogated and held for trial.

The neck wound apparently did not initially silenceDzhokhar Tsarnaev, 19, who was swearing profusely in the ambulance ride after his final confrontation with the FBI, according to a source familiar with the case. The Justice Department remained quiet Saturday on whether officials had been able to question Tsarnaev, or whether they would attempt to do so before he consults an attorney.

“We are hoping, for a host of reasons, that the suspect survives, because we have a million questions, and those questions need to be answered,” Massachusetts Gov. Deval Patrick said.

As Boston residents jubilantly flocked back to public spaces such as the Boston Common and Fenway Park — where Neil Diamond led the Red Sox crowd in a rousing rendition of “Sweet Caroline” — there was yet another tragedy to commemorate.

An Inside Look At Bombing Suspects

Thousands gathered in Wilmington, Mass., for a candlelight vigil in the hometown of Sean Collier, the MIT police officer fatally shot Thursday night before the bombing suspects’ shootout with police in the suburb of Watertown. SuspectTamerlan Tsarnaev, 26, was killed in that gun battle.

A Boston transit police officer, Richard Donohue Jr., was shot later on and remains hospitalized in serious condition. At least 52 victims from Monday’s marathon bombings are still in the hospital.

“There are people out there that want to attack this country,” Collier’s brother, Andrew Collier, told the crowd at the memorial. “They do it because they’re jealous of what we have. All of you are here because they cannot take that away.”

Near the scene of the bombings at the marathon finish line, which killed three people and injured more than 170 others, a makeshift memorial drew dozens of people Saturday morning.

Desta Alganesh wept as she watched her 12-year-old daughter, Eden Debebe, place a pink teddy bear at the memorial. They had attended the marathon and stood near the finish line but left 15 minutes before the bombings.

“Before, I felt safe. I didn’t fear anything,” Alganesh said. “But now, I can’t trust people. We feel hopeless.”

A top federal law enforcement official said the Tsarnaev brothers were carrying three firearms during the shootouts and manhunt in Boston, along with several improvised bombs.

The weapons will be traced to determine whether someone outside of the U.S. helped obtain them, the source said, speaking on condition of anonymity because the case is still evolving.

More details have begun to emerge on the dramatic shootout in which the elder Tsarnaev died early Friday, with Watertown Police Chief Edward Deveau describing how a single officer from his department faced down the two suspects in a hijacked vehicle.

The officer put his car in gear and jumped out of it, hoping they would think he was still in it as he fired from behind a tree, Deveau said. When additional officers arrived, the brothers hurled a pressure-cooker explosive at them, the chief said, similar to the ones that exploded during the marathon. The officers dove for cover, and the elder brother began walking toward them, shooting until his weapon wouldn’t fire any more, Deveau said.

Tamerlan Tsarnaev fell as he took gunfire from the officers. As they were handcuffing him, the younger brother aimed the hijacked car at them, Deveau said. “He was going to run my three police officers over. They had to get out of the way. He ran over his own brother and dragged him down the street,” he said.

About a block away, he said, Dzhokhar Tsarnaev jumped out of the car and escaped on foot.

By that time, Officer Donohue had been shot in the groin, and the officers decided to give him medical aid and look after the handcuffed suspect rather than give chase.

Dzhokhar Tsarnaev was later found Friday evening, wounded and huddled in a boat in a backyard about half a mile away.

Federal authorities were expected to file initial charges against Tsarnaev soon. The federal public defender’s office in Massachusetts said it had agreed to represent him once he is charged.

Among the questions authorities now have for the surviving brother is what happened during a six-month trip his brother took to Russia in January 2012, including whether he met with extremists in the troubled republic of Dagestan, which for years has mounted a low-level insurgency against the government in Moscow.

The FBI had interviewed the older brother the year before in response to a request from a foreign government, which U.S. sources have confirmed was Russia. “The request stated that it was based on information that he was a follower of radical Islam and a strong believer, and that he had changed drastically since 2010 as he prepared to leave the United States,” the FBI said in a statement.

But a longtime family friend, interviewed from the Dagestani capital of Makhachkala, where the brothers’ parents live, said Tamerlan Tsarnaev spent the visit to Russia helping his father remodel a room on the ground floor of their home to turn it into a perfume shop.

“The boy wasn’t gloomy, but he kept quiet and silent most of the time, as he was helping his father,” said the friend, Vyacheslav Kazakevich.

The brothers’ aunt, Maret Tsarnaeva, said her elder nephew was not an extremist.

“Yes, Tamerlan prayed. Does that actually make him a radical extremist?” she said in a telephone interview from Toronto.

She said her brother, Anzor Tsarnaev, was planning to travel soon to the United States to be with his surviving son and was troubled by allegations that his sons engineered Monday’s bombings, which the family is convinced are unfounded.

“I sit in front of the television set paralyzed with grief, and am waiting in horror the news that Dzhokhar is dead,” she said. “And then the United States, Russia and Chechnya will all celebrate their victory over terrorism and boast what a huge international plot they exposed.”

A Russian security officer said Saturday that young people who immigrate to the U.S. from the North Caucasus may only seem to fully immerse themselves in their adopted culture.

“It is naive to think that young men from Chechnya, Dagestan and Ingushetia who come to the United States would integrate into American culture all that naturally and easily,” said the official, who was not authorized to discuss the issue publicly. “They would go to American schools and play with American kids and then would come home where their tightly knit clan would pray together on the carpeted floor and then talk about U.S. imperialism and expansion.”

U.S. investigators are increasingly firm in their belief that the Boston Marathon bombings were not orchestrated by Al Qaeda.

“This guy is probably not a Chechen separatist…. I suspect he wasn’t recruited by Al Qaeda,” said a senior counter-terrorism official who has been regularly briefed on the investigation.

Fellow Muslims at the mosque in Cambridge where the Tsarnaev brothers occasionally worshiped revealed that the elder brother had been counseled a few months ago after an angry outburst.

Tsarnaev became enraged when the imam held up a picture of slain civil rights leader Martin Luther King Jr. as an example of a man to emulate, several worshipers and mosque officials recalled.

He stood up and began shouting. “You cannot mention this guy, because he’s not a Muslim!” one worshiper, who identified himself only as Muhammad, recalled Tsarnaev shouting. He said others in attendance were shocked.

“He’s crazy to me,” Muhammad said. “He had an anger inside…. I can’t explain what was in his mind.”

Anwar Kazmi, a trustee of the Cambridge mosque, said Tsarnaev was talked to later by religious leaders. “That was the only untoward sort of incident” involving the brothers, he said, adding that neither ever displayed any hints of violence.

Dzhokhar used to hang out with friends from the mosque, said Ty Barros, 21.

“He would drink with us, he would smoke [marijuana] with us. He wasn’t too religious but he was Muslim, obviously,” he said.

–By Andrew Tangel, Sergei L. Loiko and Alana Semuels, Los Angeles Times

Tangel and Semuels reported from Boston, Loiko from Moscow, Russia. Richard A. Serrano, Michael Mishak, Michael Memoli, Molly Hennessy-Fiske and Kim Murphy contributed to this report.

(CNN) – The surviving suspect in the Boston Marathon bombings suffered an injury to his throat and may not be able to talk, a federal official told CNN on Saturday, possibly hindering attempts by authorities to question him about a motive in the attack.

With one suspect dead, authorities believe answers to a motive and whether the brothers had help rest with Dzhokar Tsarnaev, who was captured Friday night just minutes after authorities had indicated that a massive manhunt for the suspect appeared to come up empty.

The official, who was briefed on Tsarnaev’s condition, spoke on condition of anonymity.

Tsarnaev was in “serious but stable condition” and “not yet able to communicate yet,” Massachusetts Gov. Deval Patrick told reporters during an impromptu briefing on Saturday.

An Inside Look At Bombing Suspects

Federal prosecutors are at the heavily guarded Beth Israel Deaconess Medical Center, where Tsarnaev is being treated for wounds.

Authorities have not publicly detailed the injuries sustained by the teen, but an official who has been briefed said Tsarnaev has been “intubated and sedated.” The official also spoke on condition of anonymity.

“I, and I think all of the law enforcement professionals, are hoping for a host of reasons that the suspect survives, because we have a million questions, and those questions need to be answered. There are parts of the investigation, in terms of information and evidence, that still needs to be run to ground,” Patrick said.

Authorities have not said whether they have questioned Tsarnaev, nor have they publicly said what charges will be filed against the teen. But a Justice Department official, speaking on condition of anonymity, told CNN the teen will face federal terrorism charges and possibly state murder charges.

The government has invoked the public safety exception, a designation that allows investigators to question the teen without reading him his Miranda rights and without a lawyer present, another Justice Department official, also speaking on condition of anonymity, told CNN.

Tsarnaev, 19, and his older brother, 26-year-old Tamerlan Tsarnaev, are accused of setting off two bombs near the finish line of the Boston Marathon on Monday, killing three people and leaving more than 170 wounded.

The arrest of Tsarnaev brought to an end a manhunt that paralyzed Cambridge, Watertown and Boston as authorities searched door to door for a suspect not only believed to be behind the bombings, but who they feared also could unleash more explosives.

Acting alone?

So far, evidence suggests that the two brothers acted alone in the bombings and subsequent shootout, Watertown Police Chief Edward Deveau said.

“From what I know right now, these two acted together and alone,” Deveau told CNN on Saturday. “I think we have to be ever vigilant, and we’re learning as we go along, but as far as this little cell — this little group — I think we got our guys.”

Even so, questions remain.

“Why did these young men who grew up and studied here as part of our communities and our country resort to such violence? How did they plan and carry out these attacks? And did they receive any help? The families of those killed so senselessly deserve answers,” President Barack Obama said Friday in a televised address.

24 hours of chaos

Shortly after the FBI released photos of the suspects Thursday night, Tsarnaev and his older brother led authorities on a wild car chase and shootout.

Officials say the brothers, for no obvious reason, killed Massachusetts Institute of Technology police officer Sean Collier while he was sitting in his car. The Tsarnaevs then hijacked a Mercedes, telling the driver they were the marathon bombers, and hurled explosives at the pursuing officers, authorities said.

“There was an exchange of over 200 rounds of gunfire, there were improvised explosive devices, and handmade hand grenades thrown at the officers at the scene,” Boston Police Commissioner Ed Davis said.

Tamerlan Tsarnaev ran out of ammunition during the shootout and was tackled by officers. That’s when the younger Tsarnaev drove the Mercedes toward the officers and his brother.

“They dive out of the way, and he (the younger brother) drives over his brother and drags him a short distance down the street,” Deveau said.

Tamerlan Tsarnaev was later pronounced dead at the hospital. He was wearing explosives and a triggering device when he died, a source briefed on the investigation told CNN.

The FBI, while executing a search warrant at a residence believed to have been affiliated with Tsarnaev, took three people into custody for questioning Friday. It was unclear Saturday what information the FBI was seeking and whether the three were released.

‘Pool of blood’

The dramatic end to the manhunt came when a Watertown man, cooped up in his house all day because of a “shelter in place” order, finally stepped outside when the order was lifted.

David Henneberry soon noticed the tarp covering the boat in his backyard was flapping in the wind and a retention strap was cut. He also noticed a small amount of blood on the tarp.

“He basically stuck his head under the tarp, noticed a pool of blood,” Henneberry’s stepson Robert Duffy told CNN.

Henneberry called 911, Duffy said.

Authorities arrived and evacuated Duffy’s stepfather. Using a bullhorn, they called out to the suspect: “Come out with your hands up.”

The man refused.

“We used a robot to pull the tarp off the boat,” David Procopio of the Massachusetts State Police said. “We were also watching him with a thermal imaging camera in our helicopter. He was weakened by blood loss — injured last night, most likely.”

A gunfight ensued, with more than 20 rounds fired.

Authorities eventually rushed the boat and took the teen into custody.

Cheers and mourning

As word of the arrest spread, hundreds of residents swarmed the streets of Watertown and Boston, surrounding police cars and cheering them on.

But the celebrations were tempered by the deaths of four people this week, all allegedly by the hands of the Tsarnaev brothers.

Three spectators were killed in the marathon bombings, and Collier, the MIT police officer, was fatally shot early Friday. At least 57 people remained hospitalized Saturday afternoon, including three in critical condition, according to a CNN count.

On Saturday night as Collier’s body was driven from the morgue to a funeral home, Boston-area police officers and firefighters lined the route to pay respect to their slain colleague.

Mistaken identity adds to family’s grief over Boston victim

The family of 8-year-old Martin Richard, who was killed in the bombings, issued a statement thanking the authorities and members of the public who helped track down the two suspects.

“None of this will bring our beloved Martin back, or reverse the injuries these men inflicted on our family and nearly two hundred others,” the Richard family said. “We continue to pray for healing and for comfort on the long road that lies ahead for every victim and their loved ones.”

Chinese student killed in bombings had followed her passion to Boston

‘Boston Stands as One’

Boston sports teams Saturday honored victims of the attacks.

The Boston Red Sox planned a special pre-game ceremony at their Saturday game against the Kansas City Royals, which was played amid heightened security at Fenway Park. Their Friday night game against the Royals was postponed because of the city lockdown and will be played Sunday, the team said.

The Boston Bruins hockey game against the Pittsburgh Penguins, originally scheduled for Friday night, was rescheduled for Saturday afternoon.

The Bruins and Penguins, along with the Red Sox, all plan to auction their Saturday jerseys to support the bombing victims.

Limited-edition T-shirts reading “Boston Stands as One” are being sold by the Boston Celtics to support the victims. Players planned to wear some of the shirts while warming up for Saturday’s game, the team said.

‘Seek forgiveness

What’s next for the Boston Marathon bombing suspect?

The Tsarnaevs’ uncle Ruslan Tsarni said their alleged actions were abhorrent.

You put a shame on our entire family – the Tsarnaev family — and you put a shame on the entire Chechen ethnicity,” Tsarni said.

Tsarni promised Saturday to help his nephew seek forgiveness from the bombing victims and advised him to tell police everything he knows.

The brothers come from a family originally from the Russian republic of Chechnya and fled the brutal wars there in the 1990s. It’s unknown how their Chechen roots may have influenced their alleged actions.

Tsarni said he believes Tamerlan Tsarnaev influenced his younger brother.

FBI agents interviewed the elder Tsarnaev in 2011 at the request of a foreign government that suspected he had ties to extremist groups, the FBI said. It declined to name the government, but a senior U.S. official told CNN on Saturday that it was Russia that made the request of the United States.

The request was based on information that Tamerlan Tsarnaev was a follower of radical Islam, the FBI said, adding it found no evidence of terrorism activity.

“I think unless we see some horrible dropping of the ball, I don’t think this is an intelligence failure,” said former CIA operative Robert Baer. “In retrospect, it might look like one, but I don’t think it is.”

The suspects’ father, who lives in the Russian republic of Dagestan, told CNN on Saturday that he believes his sons were “never, ever” involved in the Boston attacks. He also said he plans to go to the United States, though he didn’t say when.

CNN’s Holly Yan, Thomas Watkins, Melissa Gray, Carol Cratty, Susan Candiotti, John King, Joe Johns, Chris Lawrence, Deborah Feyerick, Jake Tapper, Drew Griffin, Poppy Harlow, Shannon Travis, Pamela Brown, Julian Cummings, and Nick Paton Walsh contributed to this report.


 (CNN) – Federal terrorism charges against Boston Marathon bombings suspect Dzhokar Tsarnaev could be filed soon, even as he remains hospitalized, a Justice Department official told CNN on Saturday. The 19-year-old could also face murder charges at the state level.

Federal prosecutors are at the heavily guarded Beth Israel Deaconess Medical Center, where Tsarnaev remains in serious condition while in federal custody, and they are working on formulating the charges.

This development comes amid questions as to what’s next for the suspect in the Boston Marathon bombing.

boston suspect caught

Photo courtesy of Facebook/Christian Post

President Barack Obama let it be known that he’s keenly interested in answers.

“There are still many unanswered questions,” Obama said Friday night. “Why did these young men who grew up and studied here as part of our communities and our country resort to such violence? How did they plan and carry out these attacks? And did they receive any help? The families of those killed so senselessly deserve answers.”

Tsarnaev and his older brother, Tamerlan Tsarnaev, are accused of setting off bombs at the marathon Monday, killing three people and leaving more than 170 wounded.

On Thursday night, they allegedly killed a Massachusetts Institute of Technology police officer before the older brother was killed in a shootout with police.

Dzhokar Tsarnaev was captured alive Friday night after he was found hiding in a boat in a Watertown, Massachusetts, backyard.


When will the suspect be in court?

If he is physically able, Tsarnaev could be in a courtroom for an arraignment as early as Saturday.

“In normal circumstances, someone arrested on Friday night would not be arraigned until Monday morning, but because of the extraordinary circumstance here he may be arraigned on (Saturday),” said CNN senior legal analyst Jeffrey Toobin.

Ordinarily at an arraignment, the suspect is provided a lawyer, and the defense and prosecution try to make a case to release him on bail.

“He will not get bail obviously,” Toobin said, referring to Tsarnaev. “They will set a preliminary hearing that could happen in the next 30 days. He will be indicted with the grand jury. And that’s when the case will begin.”

Should bomber suspect get a lawyer?

For now, the government is invoking the public safety exception, a designation that allows investigators to question Tsarnaev without reading him his Miranda rights, a Justice Department official told CNN on condition of anonymity.

In ordinary cases, a suspect is told by police he has the right to remain silent and he has the right to a lawyer.

But this is not an ordinary case, say U.S. Sens. John McCain and Lindsey Graham.

They urged that Tsarnaev be held as an “enemy combatant,” a designation that allows a suspect to be questioned without a lawyer and without being informed of his Miranda rights.

“Now that the suspect is in custody, the last thing we should want is for him to remain silent. It is absolutely vital the suspect be questioned for intelligence gathering purposes,” the senators said. “Under the law of war we can hold this suspect as a potential enemy combatant not entitled to Miranda warnings or the appointment of counsel.”

Alan Dershowitz, a prominent defense attorney and Harvard law professor, scoffed at the senators’ statement.

“Impossible. There’s no way an American citizen committing a domestic crime in the city of Boston could be tried as an enemy combatant,” he told CNN’s Piers Morgan. “It could never happen. And that shows absolute ignorance of the law.”

Dershowitz also said statements made by police in Boston seems to contradict the government’s reasons for invoking the public safety exception.

“The police have said there’s no public safety issue; it’s solved, it’s over,” Dershowitz said. “There are no further threats. But the FBI is saying there’s enough further threats to justify an exception.”

Former New York Mayor Rudy Giuliani said the federal government may have known about international threats about which state officials were not aware.

“You would have to know the internals of what they have before you can assess whether there is a sensible invocation or not,” Giuliani said.

If the government had prior knowledge of Tsarnaev’s activities, it hasn’t disclosed it. It did say that Tamerlan Tsarnaev was on the FBI’s radar in the past.

FBI agents interviewed Tamerlan two years ago and also looked at his travel history, checked databases for derogatory information and searched for Web postings. The agency found no connection with terror groups, an FBI official told CNN.

Tamerlan Tsarnaev, who was not a U.S. citizen, traveled to Sheremetyevo, Russia, in January 2012, according to travel records provided by a U.S. official. He returned six months later.

Federal or state trial?

Dershowitz said there are many arguments that can be made to try the case in state court. It may be hard for a prosecutor to prove which crimes were committed by Tsarnaev or his older brother, Dershowitz said.

“If he says my intent was to please my brother, they could raise the question of federal jurisdiction,” Dershowitz said.

This fight over federal or state jurisdiction could mean life or death.

Massachusetts does not have the death penalty.

There’s another big question: The National Defense Authorization Act of 2012 requires mandatory temporary military custody of certain terror suspects, but Dzhokar Tsarnaev is a U.S. citizen, and the act doesn’t apply to Americans.

U.S. Attorney Carmen Ortiz said Friday her office is ready to get started on the case.

“My journey and my office’s journey begins,” Ortiz said. “And this investigation continues. And as the days continue you will get answers.”

What is the reaction in the suspects’ homeland?

Tsarnaev’s family lives in the Russian republic of Dagestan, which is next to the suspects’ homeland of Chechnya, located in the North Caucasus region of southern Russia.

Russia’s investigative committee in Dagestan said it will not engage with the Tsarnaev family unless there is “an order from above” to do so, spokesman Rasul Temerbekov told Russian state news agency RIA Novosti on Saturday.

A spokesman for Russian President Vladimir Putin said Saturday that Russia wants to get official information from the United States about the bombing suspects, and he wants there to be contact between investigators in both countries.

It was a wild week of news, from the Boston Marathon and Kaufam County to the ricin scare, the explosion in West, Texas Fertillizer and flood waters in Chicago.

WATERTOWN, Mass. (CNN) — The second suspect in the Boston Marathon bombings was taken into custody Friday night, bringing to an end a massive manhunt in the tense Massachusetts capital worried by warnings the man was possibly armed with explosives.

After announcing the arrest on Twitter, Boston police tweeted: “CAPTURED!!! The hunt is over. The search is done. The terror is over. And justice has won. Suspect in custody.”

Boston Mayor Tom Menino tweeted “We got him,” along with a photo of himself talking to the police commissioner.

Authorities confirmed the man in custody is 19-year-old Dzhokar Tsarnaev, who escaped an overnight shootout with police that left his older brother Tamerlan Tsarnaev — the other man wanted in the bombings — dead.

The younger Tsarnaev was in serious condition with at least two gunshot wounds, Boston Police Commissioner Ed Davis said at a news conference. He was being treated at Boston’s Beth Israel Deaconess Medical Center, hospital spokeswoman Kelly Lawman said.

Tsarnaev was cornered late Friday as he was hiding on a boat in a backyard of Watertown, a suburb of Boston.

suspect5Police were alerted to his whereabouts by a homeowner who went outside after authorities lifted an order for residents to stay inside during the manhunt. The resident saw blood on a boat in the backyard, Davis said. He then lifted up the tarp covering the boat and “saw a man covered with blood,” he said.

It was that call that resulted in an arrest less than a week after two bombs exploded near the finish line of the Boston Marathon, shocking the nation and leaving a city on edge.

“There was an exchange of gunfire, and I don’t know if he was struck,” Davis said of the suspect.

Authorities, using a bullhorn, had called on the suspect to surrender: “Come out with your hands up.”

Tsarnaev, according to authorities, refused to surrender.

“We used a robot to pull the tarp off the boat,” David Procopio of the Massachusetts State Police said. “We were also watching him with a thermal imaging camera in our helicopter. He was weakened by blood loss — injured last night most likely,”

Tsarnaev was taken into custody after authorities rushed the boat, Davis said.

The standoff and subsequent arrest came just minutes after authorities indicated during a news conference that a manhunt for the suspect appeared to come up empty.

Authorities had cast a wide net for the suspect, virtually shutting down Boston and its surroundings after a violent night in which authorities say the brothers allegedly hurled explosives at pursuers, after killing Massachusetts Institute of Technology campus police officer Sean Collier and hijacking a car.

“We’ve closed an important chapter in this tragedy,” President Barack Obama said in a televised address. Even so, he vowed to seek answers to the motive in the attack and find out whether the suspects received any help to carry out their plot.

The government is invoking the public safety exception to question Tsarnaev, meaning in cases of national security a person can be questioned without being read their Miranda rights, a Justice Department official told CNN on condition of anonymity. The official is not authorized to publicly discuss the matter.

U.S. Attorney Carmen Ortiz told reporters the “government has that opportunity right now” to invoke the public safety exemption but stopped short of declaring it would take that step, saying only the suspect was in the hospital.

Republican Senators John McCain and Lindsey Graham called for Tsarnaev to be held as an enemy combatant even though he is a legal American citizen. He became a U.S. citizen on Sept. 11, 2012.

Word of the arrest spread quickly in suburban Watertown, where residents took to the streets to cheer the news that suspect had been arrested.

“Thank you. Thank you. It was our pleasure,” members of the Boston SWAT team said over a loudspeaker.

Mary Sullivan was walking her black Labrador earlier Friday night when gunshots rang out in her neighborhood.

“I’m glad it’s over,” she said. “The city and the people have gone through so much pain over these irrational decisions of these young men.”

The manhunt began late Thursday just hours after the FBI released photos of the two suspects in the marathon bombings.

“Investigators are recovering a significant amount of homemade explosives” from the scene of the shootout, Procopio told CNN.

It was not immediately clear what explosives were recovered, but the discovery followed a tense night in which authorities say the brothers allegedly hurled a homemade grenade and five pipe bombs at pursuers after killing an officer and hijacking a car.

Tamerlan Tsarnaev, 26, was wearing explosives and a triggering device when he died, a source briefed on the investigation told CNN on condition of anonymity.

The manhunt brought Boston to a near standstill. The Boston Red Sox announced they were postponing Friday night’s game against the Kansas City Royals “to support efforts of law enforcement officers.” NHL’s Boston Bruins also postponed its game against the Pittsburgh Penguins.

The city’s subway, bus, Amtrak train and Greyhound and regional Bolt Bus services were shut down. Taxi service across the city also was suspended for a time during the manhunt. Every Boston area school was closed.

Boston’s public transit authority sent city buses to Watertown to evacuate residents while bomb experts combed the surroundings for possible explosives.

Initially, authorities said the brothers started their rampage by robbing a convenience store. By late Friday, the Middlesex District Attorney’s office backtracked on the allegation, saying an investigation determined that the robbery at a 7-Eleven was unrelated.

The violent hours leading up to the capture began in Cambridge, across the Charles River from Boston, MIT officer Collier was shot and killed while he sat in his car on Thursday night, the Suffolk County District Attorney’s Office said in a statement.

The two suspects, according to authorities, then hijacked a vehicle at gunpoint in Cambridge, telling the driver that they were the marathon bombers, a law enforcement source told CNN.

At some point, apparently at a gas station, that source said, the driver was freed.

Police, who were tracking the vehicle using its built-in GPS system, picked up the chase in Watertown. The pursuit went into a residential neighborhood, with the suspects throwing explosives at police.

A shootout erupted and ultimately one bomber — later identified as Tamerlan Tsarnaev — got out of the car. Police shot him, and his brother allegedly had to run over  him as he drove away, crashed the SUV and then fled on foot, according to the law enforcement source, who spoke on condition of anonymity.

Richard H. Donohue Jr., 33, a three-year veteran of the transit system police force, was shot and wounded in the incident and taken to a hospital, a transit police spokesman said Friday. The officer’s condition was not immediately known.

Another 15 police officers were treated for minor injuries sustained during the explosions and shootout, Jennifer Kovalich, a spokeswoman for St. Elizabeth’s Medical Center, said.

Police believe the brothers are the same men pictured in images released Thursday by the FBI as suspects in the marathon bombing that killed three people and wounded dozens on Monday.

At least 58 people remained hospitalized, including three in critical condition, according to a CNN count.

The men are shown in the images walking together near the marathon finish line.

The first suspect — apparently Tamerlan Tsarnaev, according to authorities — appears in the images wearing a dark hat, sunglasses and a backpack. The second suspect, wearing a white cap, police said, is the one who remained at large throughout Friday until he was taken into custody Friday night.

But the mother of the Tsarnaev brothers refused to believe they were involved in the marathon bombings and subsequent shootout.

“It’s impossible for them to do such things. I am really telling you that this is a setup,” Zubeidat Tsarnaeva told state-run Russia Today from Dagestan, Russia.

“My son would never keep it in secret. …If there is anyone who would know it would be me. He wouldn’t hide it. But there was never a word.”

The brothers came from the Russian Caucasus region and moved to Kazakhstan at a young age before coming to the United States several years ago.

“My youngest was raised from 8 years in America. My oldest was really properly raised in our house. Nobody talked about terrorism,” their mother said.

The suspects’ parents recently returned to Dagestan in the Caucasus region after living in the United States for about 10 years because they were “nostalgic,” the father, Anzor Tsarnaev, told Russian state-run Zvezda TV.

He accused someone of framing his sons. “I don’t know who exactly did it. But someone did.”

A federal official told CNN that Dzhokar Tsarnaev came to the U.S. as a tourist with his family in the early 2000s and later asked for asylum. He became a naturalized U.S. citizen in 2012. Tamerlan Tsarnaev was not a naturalized citizen, said the official, who spoke on condition of anonymity. He came “a few years later” and was lawfully in the United States as a green-card holder.

Tamerlan Tsarnaev had studied at Bunker Hill Community College and wanted to become an engineer, according to those who knew him. He then took a year off to train as a boxer.

‘I don’t understand them’

The official said that a posting on a social media site in the elder brother’s name included the comments: “I don’t have a single American friend. I don’t understand them.”

Dzhokar Tsarnaev attended Cambridge Rindge & Latin, a public high school, said Eric Mercado, who graduated a year behind the suspect. Mercado said Tsarnaev had worked at Harvard University as a lifeguard.

“We hung out; we partied; we were good high school friends,” Mercado told CNN.

“We’re all, like, in shock. We don’t really understand. There were no telltale signs of any kind of malicious behavior from Dzhokar. It’s all coming as a shock, really.”

Mercado said he lived a block away from the suspect and did not know his older brother.

Dzhokar Tsarnaev is currently registered as a student at University of Massachusetts Dartmouth, which ordered its campus evacuated on Friday. The school is located 65 miles south of Cambridge, just west of New Bedford.

Larry Aaronson, Dzhokar Tsarnaev’s neighbor and a former teacher at the high school Tsarnaev attended, called him a “wonderful kid.”

“He was so grateful to be here, he was compassionate, he was caring, he was jovial,” Aaronson told CNN.

SEATTLE — Here’s a timeline of the Boston Marathon bombings and the killing/capture of the two suspects in the case identified by the FBI.

BOSTON — Friends were surprised to learn Dzhokhar Tsarnaev and Tamerlan Tsarnaev were suspected in the Boston Marathon bombings.