Live Updates: At least 4 dead, 159 unaccounted for after Florida condo building collapse

Search and rescue teams are continuing to work around the clock — combing through twisted steel and concrete — in hopes of finding any survivors.As the cause of the building collapse remained unknown Friday morning, Florida Governor Ron DeSantis said, "We have to figure out: Why did this happen?" "That answer isn't necessarily apparent right now, but it will be identified," he said. Everything from small - small personal items, stuffed animals, toys, people's livelihoods, obviously everything on full display," Florida Lieutenant Governor Jeanette Nuñez said on "CBS This Morning." "It is just tragic."President Biden has declared a state of emergency in Florida, on top of the ones declared by DeSantis and Miami-Dade Mayor Daniella Levine Cava. Really appreciate the president and his administration stepping up to help people who are in need."Families of people who are unaccounted for in the aftermath of the condo collapse are receiving briefings from officials every four hours at a family reunification center, said Miami-Dade County Mayor Daniella Levine Cava.The center was set up on Thursday at 9301 Collins Avenue in Surfside for anyone looking for missing relatives. "And I think that anyone who was affected by this directly wants that answer, but also, we need to know: Is this a bigger issue or is this something unique to the building?"He stressed that the primary focus right now is search and rescue, and trying to save lives.He also said FEMA is providing support to people, including those who are displaced from the building, lost everything they had and "are never going to go back." Judy Spiegel was in the 12-story building called Champlain Towers South when it collapsed. Whatever happens, I'm committed to keeping her alive in every sense of the way," Rachel said.The number of people who are unaccounted for rose from 99 on Thursday to 159 on Friday, officials said, as authorities have started to fully understand who was in the building when it collapsed, said Jim DeFede, an investigative reporter at CBS Miami."There was no real master list of who was staying inside that building on Wednesday night, so now they have a better idea," DeFede said Friday on CBSN. "And so I think when you start thinking of it in those terms, you realize the scope of it.""And one sign of that is that at the family reunification center, one of the things that they're doing, with the FBI's assistance, is they're taking DNA samples from families, because they know that once they start recovering the remains, that it's going to be hard to identify," he said.Officials at the medical examiner's office are bracing for "a very long haul," he said, "like days and days of bodies coming out of there and having to be identified."Surfside Mayor Charles Burkett said Friday that rain, debris and a fire burning under the building were creating challenges for those looking for survivors. We've been going from 7 to 7, and 7 to 7, and we'll keep going until we can get everybody who can be pulled out, pulled out of that building." Miami-Dade Fire Rescue said it was working tirelessly in ongoing search and rescue efforts following the building collapse."All the resources we have available, including local assets from partner agencies are being brought in to assist," the department tweeted. ilan Naibryf and Deborah BerezdivinNaibryf's website says he will enter his fourth year at the university and is studying physics and molecular engineering.Families are anxiously awaiting word on their loved ones who may have been killed in a condo collapse in Surfside, CBS Miami reports.A family reunification center has been set up at the Surfside Community Center, at 9301 Collins Avenue, just blocks away Champlain Towers South, where 55 units on the northeast side came tumbling down early Thursday morning.More than 75 search and rescue teams are looking for survivors in the rubble. "We will continue search and rescue because we still have hope that we will find people alive," said Miami-Dade County Mayor Daniella Levine Cava.