It happened around 8:17 a.m. on West 29th Street between 7th and 8th Avenues.
One person was critically injured and two other people suffered serious injuries. All of the injured people were taken to Bellevue Hospital.
The 62-year-old driver of the box truck stayed at the scene.
There was a large emergency response with 12 FDNY units and 60 members responding to the scene.
"So we have the Department of Buildings on scene, they are in charge of inspecting these sidewalk sheds. Right now it's believed that a box truck parked at the location hit the sidewalk shed, causing the collapse, but that's still under investigation," said Deputy Chief Michael Barvels, FDNY. "Well this is actually a commercial building, I'm not sure of the work being done, but the DOB will investigate."
The cause of the crash is under investigation.
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