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At a press conference near the site of the collapse, Miami-Dade Mayor Daniella Levine Cava said four bodies were pulled from the rubble overnight, raising the official death toll from 12 to 16 while lowering the number of missing to 147.
Cava said officials are conducting an audit of its list of unaccounted for, and that the figures remain "fluid."
Search and rescue efforts will continue as officials said they are not yet ready to pivot to the search and recovery phase.
No survivors have been pulled from the rubble since Thursday, when more 37 people were taken out alive in the hours after the building collapsed. One of them later died at the hospital.
Fifteen bodies have been recovered since.
"We are doing everything humanly possible and then some to get through this," Cava said.
President Biden, who authorized the Federal Emergency Management Agency to aid in the rescue and recovery efforts, plans to visit Surfside, Fla., on Thursday.
Last week, Biden offered sympathy for the families waiting for news about loved ones.
"There’s nothing worse than having to wait and wonder," Biden said.
More than 200 emergency personnel — including teams from Israel and Mexico — including the Army Corps of Engineers have been working around the clock on the pile of twisted metal and concrete. Rescue crews have been using light equipment, including shovels and buckets, as well as specially-trained dogs and sonar equipment, to search the pile.
Heavy rain and intermittent thunderstorms have complicated rescue operations.
It’s the largest deployment of task force resources in the state of Florida that’s not a hurricane, Gov. Ron DeSantis said. The last rescue effort of this size was undertaken in 2018, after Hurricane Michael, a Category 5 hurricane, struck.
It's unclear what caused the building, which was built in 1981, to collapse.
New documents released over the weekend showed that an engineering firm warned of "major structural damage" and the potential for "exponential damage" in 2018.
"I plan to request that our Grand Jury look at what steps we can take to safeguard our residents without jeopardizing any scientific, public safety, or potential criminal investigations," Miami-Dade State Attorney Katherine Fernandez Rundle said in a statement.
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