Hundreds of rescue workers scoured through tonnes of rubble on Thursday after a 12-storey oceanfront residential building partially collapsed in southern Florida.
At least one person died and 99 were unaccounted for, officials said.
Sally Heyman, a Miami-Dade County Commissioner, said officials have been unable to make contact with 51 people who "supposedly" stay in the building.
It is home to a mix of people including families and part-time "snow bird" residents who spend the winter months in Florida.
Miami-Dade Police Director Freddy Ramirez said that 99 people were unaccounted for and that 53 whose whereabouts were initially unknown have since been found.
Mr Ramirez did not make it clear whether everyone in the second group was alive.
"Fire and rescue are in there with their search team, with their dogs," he said. "It's a very dangerous site right now, very unstable.
"They're in search-and-rescue mode and they will be in that mode for a while. They are not quitting. They're going to work through the night. They are not stopping."
Mr Ramirez said the numbers of known casualties and people missing were likely to fluctuate.
"I don't want to set false expectations," he said. "This is a very tragic situation for those families and for the community."
A fire official said 35 people were rescued from the building in Surfside, an enclave of 5,700 residents on a barrier island across Biscayne Bay from the city of Miami.
They including two who were pulled from the rubble as response teams used trained dogs and drones in a search for survivors.
Florida Governor Ron DeSantis said it was possible that more victims would be found in the rubble. He said he planned to go to the scene.
"We'll hope for the best in terms of additional recoveries but we are bracing for some bad news, just given the destruction that we’re seeing," Mr DeSantis said.
Built in 1981, the Champlain Towers South had more than 130 units, about 80 of which were occupied.
It was unclear how many people were inside at 1.30am when an entire side of the building pulled away and fell to the ground.
"It's hard to imagine how this could have happened," Surfside Mayor Charles Burkett said.
"Buildings just don't fall down."
Construction work was being done on the roof, Mr Burkett said, but it was unclear whether the project involved heavy equipment.
Footage from WPLG Local 10, a Miami TV station, showed a rescue team pulling a boy from piles of debris, and firefighters using ladder trucks to rescue residents trapped on balconies.
Assistant Fire Chief Raide Jadallah said that rescuers were moving in heavy equipment and working to support the remaining part of the building.
"We are still continuing the search and rescue operations," Mr Jadallah said.
Mr Burkett said that part of the building with balconies facing the beach had "pancaked", meaning one floor appears to have fallen on another, sending part of the structure cascading down.
"The back of the building, probably a third or more, is totally pancaked," he said.
Resident Barry Cohen and his wife were rescued from the building.
"At first it sounded like a flash of lightning or thunder," Mr Cohen, a former vice mayor of Surfside, said at the scene.
"But then it just kept on, steadily for at least 15 to 30 seconds. It just kept on going and going and going."
Mr Cohen said construction had continued for more than a month on the building's roof.
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Kamindu Mendis bio
Full name: Pasqual Handi Kamindu Dilanka Mendis
Born: September 30, 1998
Age: 20 years and 26 days
Nationality: Sri Lankan
Major teams Sri Lanka's Under 19 team
Batting style: Left-hander
Bowling style: Right-arm off-spin and slow left-arm orthodox (that's right!)
Takreem Awards winners 2021
Corporate Leadership: Carl Bistany (Lebanon)
Cultural Excellence: Hoor Al Qasimi (UAE)
Environmental Development and Sustainability: Bkerzay (Lebanon)
Environmental Development and Sustainability: Raya Ani (Iraq)
Humanitarian and Civic Services: Women’s Programs Association (Lebanon)
Humanitarian and Civic Services: Osamah Al Thini (Libya)
Excellence in Education: World Innovation Summit for Education (WISE) (Qatar)
Outstanding Arab Woman: Balghis Badri (Sudan)
Scientific and Technological Achievement: Mohamed Slim Alouini (KSA)
Young Entrepreneur: Omar Itani (Lebanon)
Lifetime Achievement: Suad Al Amiry (Palestine)
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How to watch Ireland v Pakistan in UAE
When: The one-off Test starts on Friday, May 11
What time: Each day’s play is scheduled to start at 2pm UAE time.
TV: The match will be broadcast on OSN Sports Cricket HD. Subscribers to the channel can also stream the action live on OSN Play.
The alternatives
• Founded in 2014, Telr is a payment aggregator and gateway with an office in Silicon Oasis. It’s e-commerce entry plan costs Dh349 monthly (plus VAT). QR codes direct customers to an online payment page and merchants can generate payments through messaging apps.
• Business Bay’s Pallapay claims 40,000-plus active merchants who can invoice customers and receive payment by card. Fees range from 1.99 per cent plus Dh1 per transaction depending on payment method and location, such as online or via UAE mobile.
• Tap started in May 2013 in Kuwait, allowing Middle East businesses to bill, accept, receive and make payments online “easier, faster and smoother” via goSell and goCollect. It supports more than 10,000 merchants. Monthly fees range from US$65-100, plus card charges of 2.75-3.75 per cent and Dh1.2 per sale.
• 2checkout’s “all-in-one payment gateway and merchant account” accepts payments in 200-plus markets for 2.4-3.9 per cent, plus a Dh1.2-Dh1.8 currency conversion charge. The US provider processes online shop and mobile transactions and has 17,000-plus active digital commerce users.
• PayPal is probably the best-known online goods payment method - usually used for eBay purchases - but can be used to receive funds, providing everyone’s signed up. Costs from 2.9 per cent plus Dh1.2 per transaction.
'Ghostbusters: From Beyond'
Director: Jason Reitman
Starring: Paul Rudd, Carrie Coon, Finn Wolfhard, Mckenna Grace
Rating: 2/5
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APPLE IPAD MINI (A17 PRO)
Display: 21cm Liquid Retina Display, 2266 x 1488, 326ppi, 500 nits
Chip: Apple A17 Pro, 6-core CPU, 5-core GPU, 16-core Neural Engine
Storage: 128/256/512GB
Main camera: 12MP wide, f/1.8, digital zoom up to 5x, Smart HDR 4
Front camera: 12MP ultra-wide, f/2.4, Smart HDR 4, full-HD @ 25/30/60fps
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In the box: iPad mini, USB-C cable, 20W USB-C power adapter
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Starring: Donald Glover, Seth Rogen, John Oliver
Rating: 2 out of 5 stars
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