Miami-Dade Mayor Daniella Levine Cava said Saturday that 159 people remain unaccounted for two days after the collapse of the 12-story Champlain Towers South in Surfside, though rescue efforts are ongoing.

The death toll from the building collapse near Miami has risen to five, according to Cava. Working throughout the day, rescue crews found another body amid the rubble, but also other human remains, she said.

The discovery dropped the number of unaccounted for down to 156, Cava said.

Fire has spread amid the rubble of the collapsed condominium in South Florida, hampering rescue efforts, officials said.

The flames are deep and firefighters have not been able to find their source, Cava said.

“We’re facing very incredible difficulties with this fire,” she continued. “It’s a very deep fire. It’s extremely difficult to locate the source of the fire.” The smoke has also spread laterally, further thwarting rescue efforts.

"We're using everything possible to address this fire,” Cava told reporters Saturday. “We are using infrared technology. We're using foam. We're using water. All the tactics that we can to contain the fire and minimize the smoke spread.”

 “Our top priority now continues to be search and rescue.” Cava said. “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.”

Cava also said she “knew nothing” about a 2018 engineering report that detailed “major structural damage” to the oceanfront condominium.

This is a breaking news story. Earlier updates below.

The oceanfront condominium building that collapsed near Miami had “major structural damage” to a concrete structural slab below its pool deck that needed to be extensively repaired, according to a 2018 engineering report on the building. The report was among a series of documents released by the city of Surfside as rescuers continued to dig Saturday through the rubble of the building in an effort to find any of the 159 people who remain unaccounted for after its collapse. At least four people were killed.

While the engineering report from the firm of Morabito Consultants did not warn of imminent danger from the damage — and it is unclear if any of the damage observed was responsible for the collapse — it did note the need for extensive and costly repairs to fix the systemic issues with the building.

It said the waterproofing under the pool deck had failed and had been improperly laid flat instead of sloped, preventing water from draining off.

“The failed waterproofing is causing major structural damage to the concrete structural slab below these areas. Failure to replaced the waterproofing in the near future will cause the extent of the concrete deterioration to expand exponentially,” the report said.

The firm recommended that the damaged slabs be replaced in what would be a major repair.

The report also uncovered “abundant cracking and spalling” of concrete columns, beams and walls in the parking garage. Some of the damage was minor, while other columns had exposed and deteriorating rebar. It also noted that many of the building’s previous attempts to fix the columns and other damage with epoxy were marred by poor workmanship and were failing.

Beneath the pool deck “where the slab had been epoxy-injected, new cracks were radiating from the originally repaired cracks,” the report said.

At the site where the building once stood, scores of rescuers used big machines, small buckets, drones, microphones and their own hands on Friday to pick through the mountain of debris that had been the 12-story Champlain Towers South.

“I’m just praying for a miracle,” Spiegel said. “We’re heartbroken that she was even in the building.”

Jeanne Ugarte was coming to grips with what she feared was a tragic end for longtime friends Juan and Ana Mora and their son Juan Jr., who was visiting his parents in their condo at the tower.

“I know they’re not going to find them (alive),” Ugarte said. “It’s been too long.”

Hopes rested on how quickly crews could complete their grim, yet delicate task in Surfside, just a few miles north of Miami’s South Beach.

“Any time that we hear a sound, we concentrate in that area,” Miami-Dade Assistant Fire Chief Raide Jadallah said. “It could be just steel twisting, it could be debris raining down, but not specifically sounds of tapping or sounds of a human voice.”

Buffeted by gusty winds and pelted by intermittent rain, two heavy cranes removed debris from the pile using large claws Friday, creating a din of crashing glass and metal as they picked up material and dumped it to the side. A smoky haze rose from the site.

Once the machines paused, firefighters wearing protective masks and carrying red buckets climbed atop the pile to remove smaller pieces by hand in hope of finding spots where people might be trapped. In a parking garage, rescuers in knee-deep water used power tools to cut into the building from below.

Surfside Mayor Charles Burkett said crews were doing everything possible to save as many people as they could.

“We do not have a resource problem, we have a luck problem,” he said.

Officials said they still don’t know exactly how many residents or visitors were in the building when it fell, but they were trying to locate 159 people who were considered unaccounted for and may or may not have been there.

Flowers left in tribute decorated a fence near the tower, and people awaiting news about the search watched from a distance, hands clasped and hugging. Congregants prayed at a nearby synagogue where some members were among the missing.

On the beach near the collapsed structure, visitor Faydah Bushnaq of Sterling, Virginia, knelt and scratched “Pray for their souls” in the sand.

“We were supposed to be on vacation, but I have no motivation to have fun,” Bushnaq said. “It is the perfect time to say a prayer for them.”

Miami-Dade Police Director Freddy Ramirez said authorities were working with the medical examiner’s office to identify the bodies that have been found. Eleven injuries were reported, with four people treated at hospitals.

Miami-Dade Mayor Daniella Levine Cava said rescuers were at “extreme risk” going through the rubble.

“Debris is falling on them as they do their work,” she said. “We have structural engineers on-site to ensure that they will not be injured, but they are proceeding because they are so motivated.”

Teenager Jonah Handler was rescued from the rubble hours after the collapse, but his mother, Stacie Fang, died. Relatives issued a statement expressing thanks “for the outpouring of sympathy, compassion and support we have received.”

“There are no words to describe the tragic loss of our beloved Stacie,” it said.

While officials said no cause for the collapse early Thursday has been determined, Gov. Ron DeSantis said a “definitive answer” was needed in a timely manner. Video showed the center of the building appearing to tumble down first, followed by a section nearer to the beach.

The missing included people from around the world.

Israeli media said the country’s consul general in Miami believed that 20 of its citizens were missing. Another 22 people were unaccounted for from Argentina, Venezuela, Uruguay and Paraguay, including relatives of Paraguayan first lady Silvana de Abdo Benítez.