Four firefighters were injured while battling a three-alarm fire in New York.
Dramatic video captured the moment when a 20-foot section of a roof fell onto firefighters early Monday morning.
Officials say the fire broke out after midnight in one home - then spread to two neighboring brownstones.
Two of the firefighters hit by the debris were treated at the scene.
The other two were taken to the hospital with minor injuries.
The cause of the fire is under investigation.
FDNY says 10 people were displaced.
