(CNN) — An 8.2-magnitude earthquake struck off the coast of northern Chile on Tuesday, generating a tsunami, authorities said.
Four men and one woman died — some due to heart attacks and some crushed to death, said Interior Minister Rodrigo Penailillo.
About 300 inmates escaped from a women’s prison near the northern port city of Iquique in the immediate aftermath, he said.
The U.S. Geological Survey reported the quake, which hit at at 6:46 p.m. local time, was centered some 60 miles northwest of Iquique at a depth of 12.5 miles.
Chile’s National Emergency Office tweeted Tuesday night that it was asking everyone to evacuate the nation’s coast.
CNN Chile broadcast video of people in Antofagasta, a port city, walking through the streets as traffic piled up in some places. They appeared to be calm.
“Many people are fearful after experiencing the powerful earthquake in 2010, so they immediately fled for higher ground when they heard the tsunami warning,” said Fabrizio Guzman, World Vision emergency communications manager in Chile.
“There have been multiple aftershocks and communications have been cut off in many of the affected areas, so people are waiting in the dark hills not knowing what is to come, and hoping they will be able to return to their homes safely.”
The Pacific Tsunami Warning Center on Tuesday night canceled all tsunami warnings and watches, including those for Chile.
“Sea level readings indicate a tsunami was generated. It may have been destructive along coasts near the epicenter and could also be a threat to more distant coasts,” the center said in its evaluation.
Tsunami waves of more than 6 feet generated by the earthquake had already washed ashore on the coast of Pisagua, Chile, according to Victor Sardino with the center.
The center said nearly 7-foot waves were reported in Iquique, Chile.
There were no immediate reports of injuries.
[The Los Angeles Times reported the following: Blackouts, telephone outages and highway damage were reported in northern Chile, and tsunami warnings remained in effect after a massive earthquake struck Tuesday evening off that nation's Pacific coast.
[Major damage was reported to Highway A16 north of Iquique, a major port city of about 182,000 people at the edge of Chile’s copper mining Atacama desert region. With the exception of Iquique, the regions closest to the epicenter of the quake are remote and sparsely populated. Pisagua, about 65 miles north of Iquique, has fewer than 300 inhabitants, and the town of Arica, about 120 miles north of Iquique, has about 10,600 residents, according to recent census data.
[Much of the Chilean coast borders the oceanic Nazca plate, which is being pushed under the continental South America plate, creating a geologic hotspot responsible for the creation of the Andes Mountains.
That pressure can produce earthquakes greater than magnitude 9.0, the same class of temblor that caused the 2004 Sumatra and 2011 Japan tsunamis.
[Southern Chile produced the most powerful earthquake on record, a magnitude 9.5 earthquake in 1960, which killed thousands around the city of Valdivia, and brought tsunamis to Hawaii, Japan, the Philippines and the U.S. West Coast.]