Firefighters on Thursday found the body of one man underneath the rubble of the parking garage that collapsed in the Miami suburb of Doral, raising to three the number of known fatalities.

One worker still remains buried under tons of cement and rescue efforts are continuing.

"The chances that that person is alive are minimal, due to the amount of rubble," Miami-Dade Fire Rescue spokesperson Griselle Marino told Efe.

Nevertheless, Miami-Dade County police continue to hold out hope that the man may still be alive in a gap in the ruins.

A team of Fire Rescue specialists on Wednesday managed to extract one of the construction workers who had been trapped in the rubble, although to do so they had to amputate both his legs.

"It was the only way to save him," said Marino.

The man, who had been buried from the waist down by tons of cement rubble, was taken by helicopter to Jackson Memorial Hospital, where he was admitted in very serious condition.

In all, about 10 injured workers were transported to area hospitals.

One section of the parking garage, which was under construction on the Doral campus of Miami Dade College, suddenly collapsed on Wednesday.

No students - only construction workers - were in the parking garage at the time of the collapse.

Airborne television images broadcast on Thursday showed a huge pile of cement rubble and construction equipment at the site. EFE