A mighty 8.2-magnitude earthquake struck off the coast of northern Chile late Tuesday, triggering small landslides, cutting power and generating a tsunami.

Four men and one woman died, two who suffered heart attacks and three who were crushed, said Interior Minister Rodrigo Penailillo.

About 300 prisoners escaped from the northern port city of Iquique in the immediate aftermath, he said.

The quake struck about 8:46 p.m. local time, some 60 miles northwest of Iquique. It had a depth of 12.5 miles, the U.S. Geological Survey said.