(CNN)The death toll from Thursday’s partial collapse of a South Florida residential building has risen to four, officials said Friday morning, as a painstaking search for survivors in the rubble continued.

Three bodies were pulled from the Champlain Towers South wreckage in Surfside, Florida, overnight Thursday into Friday morning, the mayor of Miami-Dade County told ABC’s “Good Morning America.” None has been identified.The development is “devastating news for families waiting for any hope for survival,” County Mayor Daniella Levine Cava told ABC. Still, she said she is “very hopeful” others can still be rescued. The discoveries moved the death toll to four, Rachel Johnson, spokesperson for Miami-Dade Mayor’s office, told CNN.About 55 of the 136 units at Champlain Towers South crumbled at around 1:30 a.m. Thursday, leaving huge piles of rubble on the ground and materials dangling from what remained of the structure, officials said. Read MoreFlorida condo collapse: What witnesses say they sawFlorida condo collapse: What witnesses say they sawFlorida condo collapse: What witnesses say they sawThe search for dozens of missing people continued Friday morning at the site, a few miles north of Miami Beach. The collapse left at least 99 people unaccounted for as of Thursday afternoon, officials said.”We’re not giving up,” Surfside Mayor Charles Burkett told CNN Thursday night. “That is the one thing we’re not doing. We’re searching 24 hours a day, and we’re pulling as many people out as we can. That’s the whole goal right now. Nothing else matters.” The cause of the collapse wasn’t immediately known. Two people were pulled from the rubble, said Miami-Dade Fire Rescue Assistant Chief Ray Jadallah said, who did not disclose their medical conditions. Another 35 were rescued from standing portions of the building by first responders, he said. Rescuers are using dogs as well as listening devices to search for survivors, Miami-Dade Fire Rescue District Chief Jason Richard told CNN. As rescuers move through the rubble, they are accompanied by structural engineers who determine which spaces are safe and where additional shoring and other materials are needed to ensure the building doesn’t shift or come down onto rescuers, Richard explained. “So as we move through the building, we constantly monitor, making sure that there’s no movement, every piece of rubble that we move, we have to take, make efforts to stabilize the building, inch by inch,” Richard said. Engineers weigh in on the collapse Although the cause of the partial collapse wasn’t known, some engineers who saw it on video shared their expertise with CNN on why the building fell the way it did. LIVE UPDATES: Dozens unaccounted for.LIVE UPDATES: Dozens unaccounted for.LIVE UPDATES: Dozens unaccounted for.Greg Batista, a structural engineer who did work on the building years ago, said concrete repair and a spalling problem can cause collapses. Spalling can occur when part of the surface of the concrete peels, breaks or chips.”Spalling can get to a point that, if not repaired, it can lead to eventual collapse, and I’ve been to places where there have been collapses of floors, of beams, of columns,” Batista said. Batista noted that for that type of collapse to occur, the malfunction of one column is enough to bring a structure down. “All it takes is one column, and everything can come down like a Jenga,” he said. “After having seen the video … you see the actual building coming down, and the actual collapse begins on one of the lower floors. So immediately, I see that something happened down there.” This photo was tweeted by Miami-Dade Fire Rescue after a residential building partially collapsed in Surfside, Florida, on June 24.This photo was tweeted by Miami-Dade Fire Rescue after a residential building partially collapsed in Surfside, Florida, on June 24. Photos: Residential building partially collapses near MiamiThis photo was tweeted by Miami-Dade Fire Rescue after a residential building partially collapsed in Surfside, Florida, on June 24.Hide Caption 1 of 20Search and Rescue personnel work at a partial collapse building in Surfside on June 24.Search and Rescue personnel work at a partial collapse building in Surfside on June 24. Photos: Residential building partially collapses near MiamiSearch and Rescue personnel work at a partial collapse building in Surfside on June 24.Hide Caption 2 of 20Workers use a lift to investigate balconies in the still-standing portion of the building adjacent to where a wing of a 12-story beachfront condo building collapsed.Workers use a lift to investigate balconies in the still-standing portion of the building adjacent to where a wing of a 12-story beachfront condo building collapsed. Photos: Residential building partially collapses near MiamiWorkers use a lift to investigate balconies in the still-standing portion of the building adjacent to where a wing of a 12-story beachfront condo building collapsed.Hide Caption 3 of 20Yube Pettingill reacts while talking to the media as two of her family members are still missing after the partial collapse of the  condo building.Yube Pettingill reacts while talking to the media as two of her family members are still missing after the partial collapse of the  condo building. Photos: Residential building partially collapses near MiamiYube Pettingill reacts while talking to the media as two of her family members are still missing after the partial collapse of the condo building.Hide Caption 4 of 20Displaced residents being taken to nearby hotel after the partial collapse of the complex in Surfside.Displaced residents being taken to nearby hotel after the partial collapse of the complex in Surfside. Photos: Residential building partially collapses near MiamiDisplaced residents being taken to nearby hotel after the partial collapse of the complex in Surfside.Hide Caption 5 of 20The partial collapse left huge piles of rubble and materials dangling from what remained of the structure.The partial collapse left huge piles of rubble and materials dangling from what remained of the structure. Photos: Residential building partially collapses near MiamiThe partial collapse left huge piles of rubble and materials dangling from what remained of the structure.Hide Caption 6 of 20Firefighters use a ladder hose as smoke comes out of the rubble on June 24.Firefighters use a ladder hose as smoke comes out of the rubble on June 24. Photos: Residential building partially collapses near MiamiFirefighters use a ladder hose as smoke comes out of the rubble on June 24.Hide Caption 7 of 20Florida Gov. Ron DeSantis, at center in the red tie, arrives to speak to the media on Thursday. "We still have hope to be able to identify additional survivors," DeSantis told reporters near the scene. "The state of Florida, we're offering any assistance that we can."Florida Gov. Ron DeSantis, at center in the red tie, arrives to speak to the media on Thursday. "We still have hope to be able to identify additional survivors," DeSantis told reporters near the scene. "The state of Florida, we're offering any assistance that we can." Photos: Residential building partially collapses near MiamiFlorida Gov. Ron DeSantis, at center in the red tie, arrives to speak to the media on Thursday. “We still have hope to be able to identify additional survivors,” DeSantis told reporters near the scene. “The state of Florida, we’re offering any assistance that we can.”Hide Caption 8 of 20Debris dangles from the building on June 24.Debris dangles from the building on June 24. Photos: Residential building partially collapses near MiamiDebris dangles from the building on June 24.Hide Caption 9 of 20People hug at a family reunification center where evacuees were staying in Surfside on June 24.People hug at a family reunification center where evacuees were staying in Surfside on June 24. Photos: Residential building partially collapses near MiamiPeople hug at a family reunification center where evacuees were staying in Surfside on June 24.Hide Caption 10 of 20The cause of the collapse wasn't immediately known. The building was undergoing roof work, but it's not known whether this was a factor in the collapse, Surfside Mayor Charles W. Burkett said.The cause of the collapse wasn't immediately known. The building was undergoing roof work, but it's not known whether this was a factor in the collapse, Surfside Mayor Charles W. Burkett said. Photos: Residential building partially collapses near MiamiThe cause of the collapse wasn’t immediately known. The building was undergoing roof work, but it’s not known whether this was a factor in the collapse, Surfside Mayor Charles W. Burkett said.Hide Caption 11 of 20Jennifer Carr sits with her daughter as they and other evacuees wait for news at the family reunification center in Surfside.Jennifer Carr sits with her daughter as they and other evacuees wait for news at the family reunification center in Surfside. Photos: Residential building partially collapses near MiamiJennifer Carr sits with her daughter as they and other evacuees wait for news at the family reunification center in Surfside.Hide Caption 12 of 20Rescue personnel search through the rubble with dogs on Thursday.Rescue personnel search through the rubble with dogs on Thursday. Photos: Residential building partially collapses near MiamiRescue personnel search through the rubble with dogs on Thursday.Hide Caption 13 of 20Police stand guard near the scene on Thursday.Police stand guard near the scene on Thursday. Photos: Residential building partially collapses near MiamiPolice stand guard near the scene on Thursday.Hide Caption 14 of 20People on the beach look at the 12-story Champlain Towers South condo building that partially collapsed on June 24, 2021.People on the beach look at the 12-story Champlain Towers South condo building that partially collapsed on June 24, 2021. Photos: Residential building partially collapses near MiamiPeople on the beach look at the 12-story Champlain Towers South condo building that partially collapsed on June 24, 2021.Hide Caption 15 of 20The building was constructed in 1981, according to online Miami-Dade property records.The building was constructed in 1981, according to online Miami-Dade property records. Photos: Residential building partially collapses near MiamiThe building was constructed in 1981, according to online Miami-Dade property records.Hide Caption 16 of 20People lie on cots at the family reunification center in Surfside.People lie on cots at the family reunification center in Surfside. Photos: Residential building partially collapses near MiamiPeople lie on cots at the family reunification center in Surfside.Hide Caption 17 of 20The beachfront community is a few miles north of Miami Beach.The beachfront community is a few miles north of Miami Beach. Photos: Residential building partially collapses near MiamiThe beachfront community is a few miles north of Miami Beach.Hide Caption 18 of 20More than 80 rescue units responded to the scene, Miami-Dade Fire Rescue said.More than 80 rescue units responded to the scene, Miami-Dade Fire Rescue said. Photos: Residential building partially collapses near MiamiMore than 80 rescue units responded to the scene, Miami-Dade Fire Rescue said.Hide Caption 19 of 20Rescue personnel work at the site of the partial collapse.Rescue personnel work at the site of the partial collapse. Photos: Residential building partially collapses near MiamiRescue personnel work at the site of the partial collapse.Hide Caption 20 of 2016 miami building collapse 062427 miami building collapse 062430 miami building collapse 062429 miami building collapse 062431 miami building collapse 062417 miami building collapse 062418 miami building collapse 062419 miami building collapse 062420 miami building collapse 062421 miami building collapse 062410 florida building collapse 21062414 florida building collapse 21062413 florida building collapse 21062401 florida building collapse 21062428 miami building collapse 062412 florida building collapse 21062415 florida building collapse 21062404 florida building collapse 21062402 florida building collapse 21062409 florida building collapse 210624Another structural engineer, Kit Miyamoto, who is California’s seismic safety commissioner, echoed Batista’s take. “This collapse is a real classic … column failure, which means the building itself was supported by a series of pillars. If the pillars fail, everything fails. So that’s exactly what looked like that,” Miyamoto told CNN. Batista offered a glimmer of hope for those unaccounted for, saying it’s entirely possible for more people to be rescued. “If you go back to videos of building crumbling in the past, you’ve seen miracles of babies being pulled out of small voids either the day after or the week after. There’s certainly a possibility that this can happen here,” Batista said. Kenneth Direktor, an attorney for the association of residents at the condo, said the building had “thorough engineering inspections over the last several months” in preparation for compliance with a 40-year certification.What we know about the buildingWhat we know about the buildingWhat we know about the buildingThe building was constructed in 1981, according to online Miami-Dade property records. Building standards were strengthened after highly destructive Hurricane Andrew in 1992.”What that tells you is…. nothing like this was foreseeable, at least it wasn’t seen by the engineers who were looking at the building from a structural perspective,” Direktor told CNN.An engineer had already conducted inspections to determine needed repairs, but the only work that had actually commenced was on the roof, Direktor said.Shimon Wdowinski, a professor with Florida International University’s Institute of Environment, told CNN he determined in a study last year that the Champlain Towers South condo showed signs of sinking in the 1990s.The condo had a “subsidence” rate of about 2 millimeters a year from 1993 to 1999, according to his study, first reported by USA Today. While Wdowinski said this sinking alone would likely not cause the condo’s collapse, he said it could be a contributing factor. “If one part of the building moves with respect to the other, that could cause some tension and cracks,” he explained.The professor said buildings in other areas had moved at higher rates, and he didn’t find the condo building’s movement unusual.”What’s unusual is that today it collapsed,” he said.What we know about those unaccounted forAt least 30 people believed to be missing are from several Latin American countries, according to officials from the respective countries. At least nine are from Argentina. They included Andrés Galfrascoli, 45, his partner Fabián Nuñez, 55, and their daughter, Sofía Galfrascoli Núñez, 6, according to a friend. The group was staying at a friend’s condo for vacation. This is what we know about those missing in the Miami condo collapseThis is what we know about those missing in the Miami condo collapseThis is what we know about those missing in the Miami condo collapse“We don’t know anything, we don’t have any closure and that’s what hurts,” friend Nicolás Fernández told CNN.Six Paraguayans, including the sister of Paraguayan First Lady Silvana López Moreira, the brother-in-law and their three children are still unaccounted for.The first lady’s relatives live on the 10th floor of the partially collapsed building, and Paraguay’s ministry of external relations has not been able to locate the family, the ministry told CNN en Español.Officials representing Uruguay and Venezuela also reported missing citizens, and at least six Colombians resided in the building, authorities said. More locally, the family of a mother and grandmother who were in the section of the building that collapsed haven’t heard from them, the son, Pablo Rodriguez, told CNN.Little fingers and screaming led a dog walker to a boy trapped in the collapsed Florida condo rubbleLittle fingers and screaming led a dog walker to a boy trapped in the collapsed Florida condo rubbleLittle fingers and screaming led a dog walker to a boy trapped in the collapsed Florida condo rubble“We are praying for a miracle, but at the same time trying to be as realistic about it as possible,” he said. “Until we definitely know, there is hope. It’s just dwindling by the minute.”Some members from the Shul of Bal Harbour synagogue are also among those unaccounted for, Rabbi Sholom Lipskar told CNN. “This is something that transcends our capacity for understanding,” Lipskar said about the collapse. “It’s a reality, we accept it and we have to learn as we do in our culture of resilience to move forward.”Rabbi Eliot Pearlson, who leads Temple Menorah, told CNN’s Chris Cuomo, “It’s hard to explain. This doesn’t happen in America. It’s doesn’t happen in Miami Beach. It doesn’t happen in our homes. And it’s very difficult to comprehend how it’s possible.”Pearlson said he saw people come together in compassion following the collapse, and his temple will host an emergency prayer service on Friday.Three generations of one family from his temple are of the 99 people unaccounted for, he said.”I have to tell you, when I walked past ground zero, there was row after row after row of firefighters who are literally waiting to rush into a building that could fall at any time,” he added.

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