Two workers fell from near the top of a construction site in Tavares on Wednesday after a set of trusses collapsed.

The incident occurred about 6 p.m. next to the Tavares Surgery Center on Mayo Drive after one truss fell and about seven more tumbled after it, Tavares police Lt. Jason Paynter said.

“It was like a domino effect,” Paynter said.

The two unidentified men fell at least 20 feet to the concrete. One man received mostly nicks and scratches and refused medical treatment but the other fell on his head and was airlifted to Orlando Regional Medical Center as a precaution.

Both men were conscious and breathing after the fall, and the injuries are not considered life-threatening. Neither was wearing a helmet at the time of the accident.

Paynter added it is the same construction site where strong winds knocked down walls of the building last month. However, there was no wind at the time of Wednesday’s accident and it is not clear why the trusses fell.