Rescue workers scouring the debris of a collapsed condo building in a Miami suburb said they heard sounds in the rubble overnight, as officials on Friday raised the number of people unaccounted for to 159 and the confirmed death toll to four.
Miami-Dade Mayor Daniella Levine Cava told reporters that three more bodies were pulled from the wreckage overnight.
Another person was reported to have died on Thursday. The mayor also increased the number of presumed missing after authorities put the number at 99 on Thursday, reports Reuters.
Miami-Dade Fire Rescue Assistant Fire Chief Ray Jadallah said they heard sounds in the rubble overnight, but said it could be either falling debris or people tapping.
"We are listening for sounds, human sounds, and tapping," he said, as rescuers use shovels and jackhammers to tunnel under the debris to find pockets where survivors could be.
On Thursday, search teams detected sounds of banging and other noises but no voices coming from the mounds of debris.
Cava on Friday said that rescue teams were "incredibly motivated" to find anyone who might have survived the collapse.
"We still have hope that we will find people alive," the mayor said.
US President Joe Biden approved an emergency declaration in the state of Florida and ordered federal assistance to supplement state and local response efforts.
"The president's action authorizes the Department of Homeland Security, Federal Emergency Management Agency (FEMA), to coordinate all disaster relief efforts," the White House said on Friday.