Ten people were shot in the incident, New York Police Commissioner Keechant Sewell said, without saying how the other injuries occurred.
The perpetrator was still at large, and the incident was not currently being investigated as an act of terrorism, Sewell said, but would not rule out anything as a motive.
Smoke billowed out as the train car pulled into the 36th Street station in Brooklyn's Sunset Park neighborhood and opened its doors, video showed. Riders trapped inside poured out, some collapsing to the ground. Images showed streaks of blood on the platform.
"This morning, as a Manhattan-bound N train waited to enter the 36th station, an individual on that train donned what appeared to be a gas mask, he then took a canister out of his bag and opened it," Sewell told a press conference.
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