The precarious, still-standing portion of a collapsed South Florida condo building was rigged with explosive charges and set for demolition overnight, Miami-Dade County officials said late Sunday. The work has suspended the search-and-rescue mission, but officials said it will open up new areas for rescue teams to explore. Rescuers will await the “all-clear” after the demolition and then immediately dive back into the task of trying to locate any survivors buried under the rubble, County Mayor Daniella Levine Cava said. Officials had previously said that the search could resume from 15 minutes to an hour after the detonation. Read: Collapse survivors escaped with their lives, but little else “We are standing by. We are ready to go in, no matter the time of night,” Levine Cava told a news conference Sunday night. No one has been rescued alive since the first hours after the June 24 collapse. Rescuers are hoping the demolition will give them access for the first time to parts of the garage area that are a focus of interest, Miami-Dade Assistant Fire Chief Raide Jadallah has said. That could give a clearer picture of voids that may exist in the rubble and could possibly harbor survivors. The decision to demolish the Surfside building came after concerns mounted that the damaged structure was at risk of falling, endangering the crews below and preventing them from operating in some areas. Parts of the remaining building shifted on Thursday, prompting a 15-hour suspension in the work. An approaching storm added urgency to the concerns. Read: Latest victims in condo tower collapse include 2 children “I truly believe ... that the family members recognize and appreciate that we are proceeding in the best possible fashion to allow us to do the search that we need to do,” Levine Cava said. Jadallah told family members Sunday afternoon that the demolition had been scheduled for between 10 p.m. Sunday and 3 a.m. Monday, barring any last-minute glitch such as someone straying into the restricted zone around the building. Levine Cava confirmed that time frame. The mayor said residents in the area were being told to stay inside until two hours after the blast to avoid the dust raised by the explosion. Local authorities were going door to door to advise them of the timing, and to ask them to keep windows closed. Responding to concerns of missing pets, Levine Cava said she had made it “a priority since Day 1 to do absolutely everything possible to search for every animal.” She said Miami-Dade fire rescue team members had conducted three full sweeps of Champlain Towers South, including searching in closets and under beds, but “the latest information we have is that there are no animals remaining in the building.” The search at the Surfside building has been suspended since Saturday afternoon so workers could begin the drilling work and lay the explosives. Jadallah said the suspension was necessary because the drilling could cause the structure to fail, but a family member could be heard calling the delay “devastating.” So far, rescuers have recovered the remains of 24 people, with 121 still missing. Many others barely escaped. The Miami-Dade Police Department on Saturday night added Graciela Cattarossi, 48, and Gonzalo Torre, 81, to the list of those confirmed dead. Approaching Tropical Storm Elsa has added urgency to the demolition plans with forecasts suggesting there could be strong winds in the area by Monday. The latest forecasts have moved the storm westward, mostly sparing South Florida, but National Hurricane Center meteorologist Robert Molleda said the area could still feel effects. “We’re expecting primarily tropical storm force gusts,” Molleda said, referring to gusts above 40 mph (64 kph). The detonation will aim to bring the remaining portion of the building straight down and toward the street side, away from the existing pile of debris, Jadallah said. The method of demolition is called “energetic felling,” which uses small detonation devices and relies on the force of gravity. Levine Cava said that should bring the building down in place, containing the collapse to the immediate surroundings. State officials said they hired the BG Group, a general contractor based in Delray Beach, Florida, to lead the demolition. They did not immediately respond to an inquiry about how the firm was selected, but a contract for the projects calls for the state to pay the company $935,000. Read: 'Excruciating:' Florida collapse search stretches to Day 6 A spokesperson for the state’s Division of Emergency Management said the company is subcontracting with Maryland-based Controlled Demolition Inc., which experts say is among only a handful of companies in the U.S. that demolishes structures using explosives. The company was supposed to place explosives on the basement and lobby levels of the still-standing structure, according to the contract for the work. CDI is “probably one of the best” in the industry, said Steve Schwartz, a member of the National Demolition Association’s board of directors. He described the company’s president and owner, Mark Loizeaux, as “cool, calm and collected.” In implosions — using explosives to have a building fall in on itself — the charges are generally set off in rapid succession over a matter of seconds, said Scott Homrich, who heads the National Demolition Association and runs his own demolition company in Detroit, Michigan. Setting the explosives off at intervals serves to break up the building at the same time it’s coming down. Officials acknowledged that the tragedy is continuing to unfold during the July 4th holiday. “This July 4 we’re reminded that patriotism isn’t just about loyalty to country,” said Levine Cava. “It’s about loyalty to one another — to our communities, to those in need whose names or stories we may not know ever, but to whom we are connected by compassion and by resilience.”

Rescuers searching for a fifth day for survivors of a Florida condo building collapse used bucket brigades and heavy machinery Monday as they worked atop a precarious mound of pulverized concrete, twisted steel and the remnants of dozens of households. Authorities said their efforts were still a search-and-rescue operation, but no one has been found alive since hours after the collapse on Thursday. Two more bodies were recovered Monday, bringing the confirmed death toll to 11. They were later identified as 50-year-old Frank Kleiman and 50-year-old Michael David Altman in a Miami-Dade Police news release that also named 52-year-old Marcus Joseph Guara as one of the bodies recovered on Saturday. More than 150 others are still missing in the community of Surfside, just outside Miami. Read: Families of the missing visit site of Florida condo collapse The pancake collapse of the building left layer upon layer of intertwined debris, frustrating efforts to reach anyone who may have survived in a pocket of space. “Every time there’s an action, there’s a reaction,” Miami-Dade Assistant Fire Chief Raide Jadallah said during a news conference. “It’s not an issue of we could just attach a couple of cords to a concrete boulder and lift it and call it a day.” Some of the concrete pieces are smaller, the size of basketballs or baseballs. Underscoring the risks of the work, he noted that families who rode buses to visit the site on Sunday witnessed a rescuer tumble 25 feet down the pile. Workers and victims must both be considered, he said. “It’s going to take time,” he said. “It’s not going to happen overnight. It’s a 12-story building.” Relatives continued their visits on Monday. From outside a neighboring building, more than two dozen family members watched teams of searchers excavate the building site. Some held onto each other for support. Others hugged and prayed. Some people took photos. The intense effort includes firefighters, sniffer dogs and search experts using radar and sonar devices. A photo illustration compares the similar architecture and highlights the near proximity of the sister Champlain Towers. The illustration also highlights the newer and architecturally different third building of the Champlain complex Early Monday, a crane lifted a large slab of concrete from the debris pile, enabling about 30 rescuers in hard hats to move in and carry smaller pieces of debris into red buckets, which are emptied into a larger bin for a crane to remove. The work has been complicated by intermittent rain showers, but the fires that hampered the initial search have been extinguished. Jimmy Patronis, Florida’s chief financial officer and state fire marshal, said it was the largest deployment of such resources in Florida history that was not due to a hurricane. He said the same number of people were on the ground in Surfside as during Hurricane Michael, a devastating Category 5 hurricane that hit 12 counties in 2018. “They’re working around the clock,” Patronis said. “They’re working 12 hours at a time, midnight to noon to midnight.” Andy Alvarez, a deputy incident commander with Miami-Dade Fire Rescue, told ABC’s “Good Morning America” that rescuers have been able to find some voids, or spaces, inside the wreckage, mostly in the basement and the parking garage. “We have been able to tunnel through the building,” Alvarez said. “This is a frantic search to seek that hope, that miracle, to see who we can bring out of this building alive.” Others who have seen the wreckage up close were daunted by the task ahead. Alfredo Lopez, who lived with his wife in a sixth-floor corner apartment and narrowly escaped, said he finds it hard to believe anyone is alive in the rubble. “If you saw what I saw: nothingness. And then, you go over there and you see, like, all the rubble. How can somebody survive that?” Lopez told The Associated Press. Authorities on Monday insisted they are not losing hope. “We’re going to continue and work ceaselessly to exhaust every possible option in our search,” Miami-Dade Mayor Daniella Levine Cava said Monday. Deciding to transition from search-and-rescue work to a recovery operation is agonizing, said Dr. Joseph A. Barbera, a professor at George Washington University. That decision is fraught with considerations, he said, that only those on the ground can make. Barbera coauthored a study examining disasters where some people survived under rubble for prolonged periods of time. He has also advised teams on where to look for potential survivors and when to conclude “that the probability of continued survival is very, very small.” “It’s an incredibly difficult decision, and I’ve never had to make that decision,” Barbera said. As time goes on, he said, teams will begin a process called “rapid delayering, where you take more risk by moving larger amounts of rubble, because you recognize you’re running up against the time factor for survival.” How long a person can survive depends on a host of issues, including the availability of water, the severity of any injuries and the degree to which they are trapped, Barbera said. “The human dimension is huge -- the uncertainty that you could be leaving someone alive behind by ending too early,” Barbera said. “Families continue to have hope, as do rescuers, which is why you continue to see them pushing so hard within these difficult conditions.” The ultimate decision to move into the recovery phase, he said, will have to be made “with the involvement of the political authority because they’re the ultimate authority over this.” The building collapsed just days before a deadline for condo owners to start making steep payments toward more than $9 million in repairs that had been recommended nearly three years earlier, in a report that warned of “major structural damage.” A federal team of scientists and engineers are conducting a preliminary investigation at the site and will determine whether to launch a full probe of what caused the building to come down. The National Institute of Standards and Technology also investigated disasters such as the collapse of the twin towers on 9/11, Hurricane Maria’s devastation in Puerto Rico and a Rhode Island nightclub fire that killed 100 people. Previous investigations have taken years to complete.