Relief operations are under way in Florida, as the extent of the damage from Hurricane Irma becomes clear.
The storm weakened as it moved up the state’s western coast overnight but Miami and other urban areas have been battered and flooded.
Six million homes – 62% of the entire state – are without power. In the islands of the Florida Keys, officials have warned of a “humanitarian crisis”.
Media reports link at least four deaths to the storm.
Irma, which hit Florida as a category four hurricane on Sunday, has now been downgraded to a tropical storm.
It cut a devastating track across Caribbean islands, killing at least 37 people there.
Florida Governor Rick Scott said it was “going to take some time” before people could return to their homes, the Miami Herald website reports.
Speaking as he went on an aerial tour of the Keys to survey the damage early on Monday, he said: “Power lines are down throughout the state. We’ve got roads that are impassable, so everybody’s got to be patient as we work through this.”
By Jane O’Brien, BBC News, Miami
Miami dodged a bullet by and large. The eye of the storm did not hit the city but it did wallop the Florida Keys, of course, and that is where the concern is now.
Communications were pretty bad even on Friday. A number of people who had fled the Keys and checked into our hotel were struggling to keep in touch with relatives who had decided to stay behind.
Reports say that 10,000 people decided to ride out the storm. We do not know what state they are in now.
The first job rescue services will have to do is to test the integrity of the 42 bridges linking the Keys. If one of those is down, it could cause problems because it could strand any one of the islands.
The entire Keys are closed. There is no way of getting in there at the moment while the authorities assess the damage.
Although Miami was spared the brunt of the storm, large parts of the city are under water. Winds have snapped power lines and 72% of homes there are without electricity, officials say.
On the west coast of Florida, drone footage from Naples, a town on the coast of the Gulf of Mexico about 125 miles (200km) to the north-west, shows rows of shattered suburban homes on streets under water.
President Donald Trump has released emergency federal aid for Florida, describing the hurricane as a “big monster”.
Funds will be needed to care for victims, clean up debris, restore power, and repair damage to homes and businesses.
Martin Senterfitt, emergency management director for Monroe County, said a huge airborne mission was in the works, the Miami Herald reports.
“Disaster mortuary teams”, he said on Sunday, would be dispatched to the Keys, which are part of Monroe.
At 12:00 GMT, the centre of the storm was about 105 miles (170km) north of Tampa, the National Hurricane Center (NHC) said.
Some three million people live in the Tampa Bay area. The region has not been hit by a major hurricane since 1921.
Irma made landfall on Marco Island off Florida’s west coast at 15:35 local time (19:35 GMT) on Sunday, with winds of up to 120mph.
“We feel the building swaying all the time,” restaurant owner Deme Lomas told Reuters news agency by phone from his 35th-floor apartment in Miami.
At least four deaths have been connected to the storm:
Some 6.3 million people in the state were told to evacuate before Irma arrived.
There is major disruption to transport, with Fort Lauderdale-Hollywood International Airport and Miami International Airport closed for Monday.
Curfews have been imposed areas such as in Miami, where 13 people were arrested on suspicion of looting.
Irma is the most powerful Atlantic storm in a decade, and caused widespread destruction on several Caribbean islands:
Another hurricane, Jose, has been weakening over the western Atlantic, with swells due to affect parts of Hispaniola (the island split into Haiti and the Dominican Republic), the Bahamas, and the Turks and Caicos Islands, later this week.
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