An explosion in a building in New York's Chinatown section injured 12 people Thursday, among them firefighters. Three people were seriously injured.
Part of the five-story building collapsed. Initial reports attributed the cause of the blast to a gas leak, but assistant fire chief Robert Boyce said it's unclear what caused the explosion on the first floor.
He said there was a minimal collapse inside the building.
Building resident Tszkan Cheung said he heard a "boom, like a bombing, like an earthquake."
Associated Press also contributed to this article.