Several law enforcement sources have told CNN that multiple people have been injured from what appears to be gunshots at the 36th Street and 4th Avenue subway station in Brooklyn at approximately 8:30 am ET Tuesday.
The Metropolitan Transit Authority, which operates the subways, said it is investigating.
“D/N/R trains are holding in stations in both directions in Brooklyn because of an NYPD investigation at 36 St,” the MTA tweeted.
A second source told CNN five people have been shot and one person is in critical condition after the incident in the Brooklyn subway station.
Police said according to a preliminary report, a man, possibly wearing a gas mask and orange construction vest, fled the scene to an unknown location.
Investigators also said they are not sure what type of device was detonated but early reports say it may have been a smoke bomb, the law enforcement official said.
A third source said a possible smoke device may have been detonated as well.
Power has been shut off to the N and R train lines while police investigate.
