Florida is allowing some residents to return to their shuttered homes and reopened several airports after Hurricane Irma's pounding winds and storm surges ripped through the state, prompting the evacuation of 6.5 million people.
Irma, one of the most powerful Atlantic hurricanes on record, was downgraded to a tropical depression on Monday. It will likely dissipate from on Tuesday evening, the National Hurricane Centre said.
Local authorities told around 90,000 residents of Miami Beach and from some parts of Florida Keys they could go home but warned it may prudent not to remain there.
"Returning residents should consider that there are limited services. Most areas are still without power and water. Cell service is spotty. And most (petrol) stations are still closed," the Monroe County of Board of County Commissioners said in a Facebook post.
After leaving a trail of destruction on several Caribbean islands, killing nearly 40 people, Irma caused record flooding in parts of Florida.
The US aircraft carrier Abraham Lincoln has arrived off Florida's east coast and two amphibious assault ships will arrive on Tuesday to help in the Keys, where Irma first made landfall on Sunday as a Category 4 hurricane.
The US Department of Defence said the military will distribute food and help evacuate 10,000 Keys residents who did not leave before the storm.
Heather Carruthers, the Monroe County Commissioner, said people had been killed in the archipelago, where nearly 80,000 permanent residents live. She did not have a count on how many.
"We are finding some remains," she said in an interview with CNN. Video footage of the islands showed homes torn apart by sustained winds of up to 210km/h.
Several major airports in Florida that halted passenger operations due to Irma began limited service on Tuesday, including Miami International, one of the busiest US airports. Thousands of flights had to be cancelled.