Sweetwater Mayor Orlando Lopez said Officer Juan Llera was ready for the worst when he ran towards danger on Thursday afternoon.
"I heard a 'boom' like a bomb had exploded," Llera said, according to a report y Local10 News. "At first I thought it was a terrorist attack."
Llera said he saw three injured construction workers. One had a head injury and was passing in and out of consciousness, another one had a leg injury and the third was lying on the street unconscious. He started to perform CPR on the worker who was lying on the street.
"We were able to keep him alive to send him to the hospital," Llera said.
Miami-Dade Fire Rescue personnel took the survivors to Kendall Regional Hospital's trauma center. As search-and-rescue operations continue, authorities said the collapse left at least six dead.