Early on Monday, Manhattan residents reported a blast at a building on Manhattan's Upper East Side.
Hundreds of firefighters rushed to the scene between Park and Madison Avenues.
A terrorist attack was quickly ruled out. At the time of the blast, a power company was investigating reports of a gas smell by local residents.
CNN television host Larry King who was in the area described the blast as sounding like a bomb.
Several people were injured including passers by and fire fighters, one of whom suffered neck and back injuries.
Streets around the area were cordoned off while fire crews attempted to bring the blaze under control.
Firefighters on the roof of the next building examine the damage.
The blast also damaged nearby buildings, causing windows to be blown out.
Shattered glass, bits of wood and brick were strewn across the vicinity, causing injuries.
Emergency crews examined the damage from neighbouring buildings which had been evacuated.