At least one person is dead and many trapped after a wing of a 12-storey apartment building collapsed in Florida.
Nearly 100 people were still unaccounted for at midday, authorities said, raising fears the death toll could climb sharply with one person confirmed dead.
Authorities did not know how many were in the tower when it fell.
Surfside Mayor Charles Burkett described the building as “literally pancaked”.
“That is heartbreaking because it doesn’t mean, to me, that we are going to be as successful as we wanted to be in finding people alive,” he said.
Hours after the collapse, searchers were trying to reach a trapped child whose parents were believed to be dead.
In another case, rescuers saved a mother and child, but the woman’s leg had to be amputated to remove her from the rubble, Frank Rollason, director of Miami-Dade Emergency Management, told the Miami Herald.
Video showed fire crews removing a boy from the wreckage, but it was not clear whether he was the same person mentioned by Mr Rollason.
"This whole building here, it's completely gone," a person can be heard saying.
Governor Ron DeSantis, who toured the scene, said television did not capture the scale of what happened.
Rescue crews are “doing everything they can to save lives. That is ongoing, and they’re not going to rest”, he said.
Teams of 10 to 12 rescuers were entering the rubble at a time with dogs and other equipment, working until they tire from the heavy lifting, then making way for a new team, Florida Chief Financial Officer Jimmy Patronis, the state’s fire marshal, said.
“They’re not going to stop just because of nightfall,” Mr Patronis told Miami television station WPLG.
“They just may have a different path they pursue.”
Mr Patronis said he was deeply moved by the image of a bunk bed near the now-exposed top of the building.
“Somebody was probably sleeping in it,” he said.
“There’s all those what-ifs.”
What caused the building to collapse?
Authorities did not say what may have caused the collapse. On video footage captured from nearby, the centre of the building appeared to fall first, with a section nearest the ocean teetering and coming down seconds later as a huge dust cloud swallowed the neighbourhood.
Work was being done on the building’s roof, but Mr Burkett said he did not see how that could have been the cause.
Miami-Dade County Mayor Daniella Levine Cava said she got a call from President Joe Biden, who offered federal aid. Hotels opened to some of the displaced residents, she said, and deliveries of food, medicine and more were being hastily arranged.
Rescue officials tried to determine how many people might be missing and asked residents to check in with them.
About half of the building’s roughly 130 units were affected, the mayor told a news conference.
Rescuers pulled at least 35 people from the wreckage by mid-morning, and heavy equipment was being brought in to help stabilise the structure to give them more access, Raide Jadallah, of Miami-Dade Fire and Rescue, said.
The tower has a mix of seasonal and year-round residents, and while the building keeps a log of guests, it does not keep track of when owners are in residence, Mr Burkett said. The Argentine Consulate in Miami said nine people missing in the collapse were from Argentina.
Earlier, Mr Burkett said two people were brought to the hospital, one of whom died. He added 15 families walked out of the building on their own.
The collapse, which appeared to affect one leg of the L-shaped tower, tore away walls and left a number of homes in the still-standing part of the building exposed in what looked like a giant dollhouse.
Television footage showed bunk beds, tables and chairs inside. Air conditioners hung from some parts of the building, where wires now dangled.
Fleeing residents in horror as home tumbles
Piles of rubble and debris surrounded the area, and cars up to two blocks away were coated with a light layer of dust from the debris.
As crews went through the rubble about midday, smoke wafted through the area. The source was not clear.
Barry Cohen, 63, said he and his wife were asleep in the building when he first heard what he thought was a crack of thunder.
The couple went onto their balcony, then opened the door to the building’s hallway to find “a pile of rubble and dust and smoke billowing around”.
“I couldn’t walk out past my doorway,” Mr Cohen said.
“A gaping hole of rubble.”
He and his wife made it to the basement and found rising water there.
They returned upstairs, screamed for help and were eventually brought to safety by firefighters using a cherry-picker.
Mr Cohen said he raised concerns years ago about whether nearby construction might be causing damage to the building after seeing cracked pavers on the pool deck.
Calls for answers as to why building fell
Surfside City Commissioner Eliana Salzhauer told WPLG the building’s county-mandated 40-year recertification process was ongoing.
Ms Salzhauer said the process was believed to be proceeding without difficulty. A building inspector was on-site Wednesday.
“I want to know why this happened,” Ms Salzhauer said.
“That’s really the only question. ... And can it happen again? Are any other of our buildings in town in jeopardy?”
At an evacuation site set up in a nearby community centre, people who live in buildings neighbouring the collapse gathered after being told to flee. Some wept. Some were still dressed in pyjamas. Some children tried to sleep on mats spread on the floor.
Jennifer Carr was asleep in a neighbouring building when she was awakened by a loud boom and her room shook. She thought it was a thunderstorm but checked the weather app on her phone and saw none.
The building’s fire alarms went off, and she and her family went outside and saw the collapse.
“It was devastation,” Ms Carr said. “People were running and screaming.”
Nicolas Fernandez waited early on Thursday for word on close family friends who lived in the collapsed section of the building.
“Since it happened, I’ve been calling them nonstop, just trying to ring their cellphones as much as we can to help the rescue to see if they can hear the cellphones,” she said.
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