Puerto Rico Governor Wanda Vazquez declared a state of emergency on Tuesday after a series of earthquakes killed at least one person, toppled buildings and knocked out power to nearly the entire island of more than 3 million people.<br /><br />The largest of the quakes in the U.S. territory registered at magnitude 6.4, the most powerful to hit the Caribbean island in 102 years.<br /><br />With two large power plants shut down, drinking water was cut off to at least 300,000 customers, Vazquez told a news conference.
