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SANTIAGO, Chile - Authorities have lifted tsunami warnings for Chile's long coastline after a magnitude-8.2 earthquake struck the country's northern coast.

Six people were crushed to death or suffered fatal heart attacks.

President Michelle Bachelet says the extent of damage from Tuesday night's quake is still being assessed. She's declared a state of emergency in the region and has sent a military plane with 100 anti-riot police to join 300 soldiers deployed to prevent looting and round up 300 inmates who escaped from a women's prison.

The powerful quake and more than 20 significant aftershocks touched off landslides that blocked roads, knocked out power for thousands, damaged an airport and provoked fires that destroyed several businesses.

Near the quake's offshore epicenter, authorities say hospitals treated minor injuries and some homes made of adobe were destroyed.

A magnitude-8.2 earthquake struck Tuesday evening off northern Chile, triggering a small tsunami for the South American coast and leaving at least two people dead.

The mayor of Tarapaca attributed the deaths to heart attacks. Several more are seriously hurt.

The powerful quake's epicenter was located in the Pacific Ocean about 60 miles northwest of Iquique, Chile, and 12.5 miles deep, the United States Geological Survey reported. The quake occurred at 8:46 p.m. local time (7:46 p.m. ET).

A tsunami warning was issued for the coasts of Chile, Peru and Ecuador, while high-wave watches were posted for residents of coastal Colombia, Panama and Costa Rica, the National Oceanic and Atmospheric Administration said.

Waves about 6 feet high hit cities along the northern coast, the Associated Press reported. There were no immediate reports of possible damage or casualties.

NOAA added that Hawaii could be put on warning or watch status as the quake and tsunami are evaluated. The earliest that waves might reach the island would be about 3:25 a.m. Wednesday (9:25 a.m. ET).

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