A manhole cover exploded outside of a day care center in Morrisania Monday afternoon.
Witnesses say parents were picking up their children at the time of the blast near 161st Street and Cauldwell Avenue.
A surveillance camera captured the explosion. The top ripped off and shattered into the air.
Fire officials say salt placed on the street to melt snow may have corroded wires and caused the explosion.
Utility workers will make repairs.
The day care was evacuated, but officials say no one was hurt.