More than half of Puerto Rico's 3 million people remained without power on Wednesday and thousands slept outdoors after earthquakes toppled homes on the Caribbean island and raised fears more could collapse.

Tuesday's quakes, including the most powerful one to strike the U.S. territory in 102 years, killed at least one person and destroyed or damaged about 300 homes. A state of emergency was declared.

The south of the island was hardest hit, dozens of homes collapsing in towns like Yauco, Guanica and Guayanilla during a 6.4 magnitude earthquake and 5.9 aftershock.