Updated at 11:20 p.m. ET
The governors of Florida and Puerto Rico have declared pre-emptive states of emergency ahead of Hurricane Irma, a powerful Category 4 storm churning through the Caribbean on a westward track. The U.S. Virgin Islands also declared a state of emergency.
Forecasters say the dangerous storm also looks increasingly likely to hit the U.S. East Coast, either in South Florida or the Carolinas.
"We have established protocols for the safety of all," Puerto Rico Gov. Ricardo Rossello said, urging islanders to take precautions.