Puerto Rico hit by 6.4 magnitude earthquake

Puerto Rico's string of tremors continued Tuesday morning as another earthquake knocked out power and left at least one person dead.

A 6.4 magnitude earthquake rocked Puerto Rico early on Tuesday, centered off the island's southern coast, CNN reports. At least one person, a 73-year-old man, was killed, while at least eight have been injured, The Associated Press reports.

This comes one day after Puerto Rico was struck by a 5.8 magnitude earthquake, which followed several quakes ranging from 4.7 to 5.1 in magnitude rocking the island since Dec. 28. A 6.0 aftershock followed Tuesday's earthquake about three hours later, per AP.

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Although a tsunami watch was issued by local authorities on Tuesday, it was later canceled, and the United States National Tsunami Warning Center said there was no tsunami threat, The New York Times reports. Víctor Huérfano, director of Puerto Rico's Seismic Network, told AP this is expected to be "the largest quake for now."