A 6.4-magnitude earthquake struck Puerto Rico before dawn on Tuesday, killing at least one person and causing an island-wide power outage. A tsunami alert was also originally issued for Puerto Rico and the U.S. Virgin Islands, but was later canceled.
The U.S. Geological Survey said the earthquake hit at 4:24 a.m. The organization originally gave the reading of 6.6, but later adjusted it.
Officials said the quake killed a 77-year-old resident, who died after a wall collapsed on the island's southern coast. The earthquake also caused widespread damage, although the exact amount is unknown because communication is down for much of the island.
"We expect that this will be the largest quake for now," said Víctor Huérfano, director of Puerto Rico's Seismic Network. "The aftershocks will continue for some time."