Still 'hope' as rescuers race fire to find Florida collapse survivors

• 'Major structural damage' found at collapsed building in 2018: report

SURFSIDE, (United States): Florida officials continued to hold out hope Saturday for survivors of a high-rise apartment building that partially collapsed three years after an engineer had warned of "major structural damage."

But fire was complicating the increasingly desperate effort to find 159 people still unaccounted for more than two days after part of the building pancaked into a mountain of debris.

"We're facing incredible difficulties with this fire," Miami-Dade County mayor Daniella Levine Cava told reporters early Saturday. She said workers dug a trench to control the "very deep" blaze, but that smoke had spread throughout the site.

But, she added: "We continue to have hope. We're continuing to search. We're looking for people alive in the rubble, that is our priority and our teams have not stopped."

Four people have been confirmed dead after the 12-story oceanfront building in Surfside, near Miami Beach, collapsed as residents slept inside early Thursday.

Cava said Saturday that the casualty numbers were unchanged from the day before. Still, the passage of time with no further survivors being found raised fears of a much higher death toll as rescuers sift through the debris with heavy machinery and sniffer dogs, and as increasingly frustrated families continued their agonizing wait.

"We have a friend who got out of the building with her husband," Gina Berlin, 54, who lives in the neighbourhood, told AFP. "She is still traumatized... And I am still in shock. I came to pray for the missing ones."

At a makeshift memorial on a nearby street, well-wishers piled flowers and left candles. People have posted dozens of pictures of missing persons.

Two big cranes on Saturday continued shifting debris as the smell of burnt rubber and plastic hung in the baking Florida heat.

Authorities and experts have stressed that the causes for Champlain Tower South's collapse are still unknown. But the report of an engineering consultancy that studied the building in 2018, released late Friday by officials, underlined early concerns.

It said its inspectors found "major structural damage" to the concrete slab below a ground-level pool deck and "abundant" cracking and crumbling in the parking garage.

"Failure to replace the waterproofing in the near future will cause the extent of the concrete deterioration to expand exponentially," warned the report, from the Morabito Consultants firm.

Most of the damage was "probably caused by years of exposure to the corrosive salt air along the South Florida coast," it said.

The report did not indicate that the 40-year-old building risked collapse, but said it needed repairs to maintain "structural integrity."

A lawyer for the building's owners told the New York Times that work was "just about to get started" on the multi-million dollar repairs.

Completed in 1981, Champlain Towers was due for a safety recertification, and was undergoing construction work on its roof as part of that process.

Florida governor Ron DeSantis told reporters Saturday that local officials were "considering potentially evacuating" a nearby building that was built by the same developers, around the same time, as the collapsed structure. But he said there were no indications of immediate danger there.

A study led by Florida International University found signs of land subsidence - a phenomenon affecting much of the East Coast - at the site in the mid-1990s.

Mayor Cava said the county would immediately undertake a one-month safety audit of all buildings 40 years or older.

"All of our training tells us that for at least the first 72 hours, there are high likelihood of people that could be alive in there," Danny Cardeso, with Miami-Dade Fire Rescue, told CBS News.

Officials in Canada said Friday that at least four of its citizens may be "affected," without elaborating. At least 18 Latin American nationals are among the missing - including Uruguayans, Argentines and Paraguayans.