Five people were shot dead in a New York City subway station in Brooklyn, police sources said.
The New York City Fire Department said 13 people were injured and taken to hospitals.
Firefighters responding to reports of smoke at the 36th Street station in Sunset Park found several downed people and unexploded ordnance.
A photo from the scene showed people tending to bloodied passengers lying on the station floor.
The New York Police Department said there were no active explosives at this time and urged witnesses to provide information and the public to stay away from the area.
A man was seen throwing a device into the Brooklyn subway station and then opened fire, law enforcement sources told NBC New York.
It is understood that preliminary information indicates that a suspect was dressed in construction equipment.
He added that emergency vehicles and delays were expected in the area.
Trains serving this station were delayed during the morning rush hour.
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