The collapse happened at 40th Street and Seventh Avenue.

 

Four people were injured in a scaffolding collapse at 40th Street and Seventh Avenue in Manhattan on Friday morning, a fire department official said.

 

The official said the 911 call came in about 10:04 a.m. Three pedestrians were taken to Bellevue Hospital with minor injuries. One firefighter was taken to Roosevelt Hospital, also with minor injuries.

 

Bystanders speculated the collapse may have been caused by wind, but officials have not yet pinpointed the cause.

 

A spokesperson for the Department of Buildings said the agency is "still gathering details."

One bystander, 29-year-old Manhattan resident Dwayne Gayle, has worked in construction and believed the collapse was inevitable.

"That kind of material, that's supposed to be for the inside, not the outside," Gayle said. "That was an accident waiting to happen."

Another pedestrian walking by shook her head at the wreckage.

"I'm gonna walk in the street from now on!" she exclaimed.

Follow Danielle Tcholakian on Twitter @danielleiat