Hurricane Dorian has claimed at least 20 lives, Bahamas Prime Minister Hubert Minnis said, warning the storm had caused "generational devastation" as it began lashing the US east coast.
Minnis confirmed the storm's death toll had risen to at least 20 during a news conference in which he described the unthinkable damage that parts of his island nation had sustained.
The US Coast Guard and Britain's Royal Navy airlifted survivors and ferried in emergency supplies as floodwaters receded in the Bahamas, while the center of the strengthening storm pushed along the coasts of North and South Carolina.
The Miami-based National Hurricane Center (NHC) said Dorian, which has already wrought major damage on its course through the Atlantic, was packing maximum sustained winds of 115 miles per hour (185 kilometers per hour), making it a Category 3 storm on the five-level Saffir-Simpson scale.
"Hurricane conditions are expected along portions of the South Carolina coast later this morning," the NHC said in its 0900 GMT (5am) bulletin.
Meanwhile, the United Nations said 70,000 people on Grand Bahama and Abaco islands were in "immediate need" of aid.
PM Minnis also warned looters will be prosecuted "to the fullest extent of the law," and said additional police and defense force officers had been deployed.
Shelter, safe drinking water, food and medicine were urgently needed for some 50,000 people on Grand Bahama and between 15,000 and 20,000 on Abaco, UN emergency relief coordinator Mark Lowcock said after a meeting with the PM.
"Speed is of the essence," Red Cross official Stephen McAndrew said of rescue operations on the two northernmost islands in the Bahamas archipelago which were pummeled by one of the strongest Atlantic storms on record.
People on Grand Bahama were using jet skis and boats to pluck victims from homes flooded and pulverised by the monster storm.
US and British helicopters were conducting medical evacuations, aerial assessments to help coordinate relief efforts, and reconnaissance flights to assess the damage.
President Donald Trump spoke by telephone to the Bahamian leader and pledged US assistance, the White House said.
"A big section of the Bahamas was hit like few people have seen before," Trump said.
"They need a big hand."
Aerial footage showed scenes of catastrophic damage in Abaco with hundreds of homes missing roofs, cars submerged or overturned, widespread flooding and boats reduced to matchwood.
As rescue efforts ramped up, Dorian rolled along the coasts of South and North Carolina, the NHC said.
According to the 0900 GMT bulletin, the storm was located about 80 miles south of Charleston, South Carolina and was moving north at eight miles per hour.
It had, however, left Florida largely unscathed.
"We got lucky in Florida, very, very lucky indeed," Trump said.
Life-threatening storm surge with significant coastal flooding was expected along large parts of the southeast and mid-Atlantic coast over the following days, the NHC said.
The center predicted the Carolinas could be hit with dangerous storm surge of up to seven feet (2.1 meters) and six to 12 inches of rain.
"We are very well prepared," Trump said.
Roberto Smith, who was born in Abaco but now lives in Florida, said he was worried about his family.
"I spoke to my dad on the night of the hurricane, on Sunday night, and his roof blew up," Smith told AFP. "I haven't spoken to him since then. I am really worried. I can't even eat." "The island is devastated," he added. "There is no power, no running water, no electricity."
The US Coast Guard said it had rescued 61 people, including 19 injured patients from Abaco island's Marsh Harbour clinic who were flown to Nassau Tuesday. USAID, the US relief agency, said it was airlifting supplies such as plastic sheeting for shelter, hygiene kits and water from Miami.
Larry Lewis, who runs Paradise Watersports in the city of Freeport on Grand Bahama, said most of the floodwaters had receded but some roads remained impassable.
He said very few stores were open. "I saw a lot of people scrapping for something to eat," he told AFP.
A British landing ship, the RFA Mounts Bay, launched boats carrying supplies for Marsh Harbour on Abaco and Britain's Department for International Development said it had deployed a team of three humanitarian experts.
"The clock is now ticking to get help to those in need," British International Development Secretary Alok Sharma said.
Dorian dumped as much as 30 inches of rain on the Bahamas, a former British colony.
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