A magnitude 6.5 earthquake struck Puerto Rico in the early hours of Tuesday, according to the U.S. Geological Survey.
The quake hit close to the town of Tallaboa on the island’s south coast, at 4:24 a.m. local time (03:24a.m EST) at a depth of 10 kilometers, USGS said.
The earthquake’s magnitude was initially reported as 6.6, but was revised down.
The Electric Power Authority reported an island-wide power outage, saying on Twitter that power plants had activated their protection mechanisms and gone out of service. Authorities said they were evaluating the power infrastructure, and urged residents to remain calm.