A 12-foot aluminum beam fell from a billboard above the M&M store in Times Square Wednesday morning — injuring two tour bus workers below.

A contractor for Landmark Signs was working on a sign roughly 10-stories tall when he lost his grip on the metal beam and it plummeted to the sidewalk around 8:45 a.m.at Seventh Avenue and West 48th Street, authorities said.

Two pedestrians working for Big Bus Tours New York were struck by the tumbling debris and rushed to Bellevue hospital, but the extent of their injuries wasn’t immediately known, according to authorities.

A Big Bus ticket seller said the injured men are named Goose and Nino.

One witness, who was only three feet away from the metal beam when it fell, felt lucky he didn’t get hit.

“I was scared. It was very dangerous,” he said. “I just saw a guy get hit, and he fell to the ground. There was nothing we could do.”

Wet weather may have played a role in the accident, according to the Office of Emergency Management.

A complaint was posted Wednesday morning on the Department of Buildings website referencing the incident.