In Florida, at least four people are dead and 99 others remain unaccounted for after a 12-story condominium near Miami Beach suddenly collapsed early Thursday morning. Rescue crews used dogs and earth-moving equipment to sift through the building’s wreckage, freeing dozens of survivors trapped beneath a massive pile of rubble. The high-rise apartment in the town of Surfside was built in 1981 and was undergoing a required 40-year recertification process. It was due to undergo repairs for rusted steel and damaged concrete. It’s not known if saltwater corrosion or neglect played a role in its sudden collapse just after 1 a.m. on Thursday.