Just one week after surviving a massacre that killed 17 people, grieving students confronted Florida lawmakers Wednesday to demand a ban on weapons like the one used to kill their classmates.
"This is for every single kid who fears for their life," said Alfonso Calderon, a student at Parkland's Marjory Stoneman Douglas High School.
"This is more than Parkland. This is more than Florida. This is more than the United States. This is something serious. It is about human lives."
As survivors took up their fight in Tallahassee, other students from Palm Beach to Washington walked out in solidarity -- disgusted by yet another school massacre with no change in gun laws.
Students as several Washington state schools, including Bellingham and Central Kitsap, also planned walkouts on Wednesday.
Protesters chant "vote them out" at a #NeverAgain rally: Outside the state Capitol building, Stoneman Douglas student Florence Yared stressed that she didn't want to ban all guns.
"I'm not trying to take away your Second Amendment rights, nor am I trying to eliminate all guns. But we cannot protect our guns before we protect our children," the 17-year-old said.
"The only purpose of an assault weapon like this is to kill, and to kill as many people as possible. The AR-15 is not a self-defense weapon. It is called an assault weapon. Assault. Think about this word."
President Trump will host a listening session Wednesday afternoon: Attendees at the White House will include survivors from Stoneman Douglas and families impacted by the Columbine High School and Sandy Hook Elementary School shootings.
Thousands of students rally across Florida: Some walked 10 miles to get to Stoneman Douglas High School in an act of solidarity.
Protests spread up the East Coast: Hundreds of students in the Washington DC area also walked out in support of the Florida students.
'Enough thoughts and prayers'
Police say 19-year-old Nikolas Cruz used an AR-15-style rifle to gun down 17 people at the high school. He's in custody, facing 17 counts of premeditated murder.
The fact that such weapons are still legal spurred students to mobilize en masse.
"Our goal here is to get a complete ban on assault weapons in the state of Florida, and we will not accept anything else," student Spencer Blum said.
Kai Koerber is one of about 100 students from Parkland's Stoneman Douglas High School meeting with several lawmakers Wednesday.
"The legislation needs to change, because we've fallen victim to lazy legislation for far too long," he said.
Stoneman Douglas student Delaney Tarr said she wants action, and not just words.
"We've had enough thoughts and prayers," she said.
As students rallied outside the Capitol building, thousands of teens from across the state walked out in support of Stoneman Douglas students.
Some walked 10 miles, arm-in-arm, to get to Stoneman Douglas, CNN affiliate WPLG reported.
"We're exhausted, but couldn't be prouder to be here," a senior from Palm Beach County said.
At Cypress Bay High School in Weston, students streamed to a nearby park to hold their own rally in support of the Stonman Douglas students. Even the city and school officials supported them.
'If you're not with us, you're against us'
Stoneman Douglas sophomore Daniel Bishop said he huddled in a corner for 2 1/2 hours as bullets flew in his school last week. He traveled 450 miles to Tallahassee to push for gun control legislation.
"People I know died. My friends died," he said. "If our government was doing something correctly, then we wouldn't be here today. And I truly believe that we can come here and make a difference if we all just work together to pass bipartisan legislation."
But the grief-stricken teens suffered a blow Tuesday, when state lawmakers voted 71-36 against a measure to consider a ban on semi-automatic weapons. Legislators did, however, declare pornography to be a public health risk.
"It was just so heartbreaking to see how many (voters') names were up there, especially after it was my school," said 16-year-old Sheryl Acquaroli, a junior at Stoneman Douglas, said after the assault weapons discussion was rejected.
"It seemed almost heartless how they immediately pushed the button to say no."
Almost all 71 lawmakers who voted against considering an assault rifle ban have an "A" rating from the National Rifle Association.
Senior Chris Grady, 19, gave the politicians an ultimatum:
"If you're not with us, you're against us, and you're against saving the lives of innocent children. And we are going to be voting you out," he said.
Students have differing opinions on guns
Kyle Kashuv, 16, a Stoneman Douglas student, identifies as a Republican and a conservative. He said he has always been pro-guns, but looks at things differently since the shooting.
"We have such a limited government that should not be totally reliant on ... the police. We should be able to defend ourselves as citizens," he said. "I still totally believe that but I think that there should be a limit to who could acquire such weaponry."
He said some people should not have access to guns.
"If you're not of the right mindset, you're not mentally stable, then you should not be able to acquire that," he said.
But Zach Lesk, a junior at J.P. Taravella High School in Coral Springs, said no one should have automatic weapons. He joined Stoneman Douglas students at the Capitol on Wednesday.
"We can't have people walking around with automatic weapons," he said. "They're made for mass murder."
Governor working on proposal
Republican Florida Gov. Rick Scott held a roundtable on school safety Tuesday, and planned to have a proposal by Friday.
"I am bringing local and state leaders together to find solutions on how to prevent violence in our schools and keep guns out of the hands of mentally ill individuals," he said.
"This is an urgent matter that we must address quickly."
'When we're not here, we're at a funeral'
While the survivors are fighting for new legislation hundreds of miles from home, their slain friends and teachers aren't far from their thoughts.
"When we're not here, we're at a funeral," government teacher Jeff Foster said.
Chris Hixon, an athletic director who also served as the school's wrestling coach, will be laid to rest Wednesday.
And a visitation will take place Wednesday evening for Aaron Feis, an assistant football coach who died when he threw himself in front of students to shield them from bullets.