* GRAPHIC WARNING
* The gunman was on the northbound N train when he put on a gas mask at 8.24am and pulled a smoke cannister out of his bag
* He unleashed it in the train car, then opened fire, wounding ten people before vanishing as the train pulled in to the station
* The gunman is described as a black male, weighing 180lbs and approximately 5ft 5in tall
* He was wearing a green construction-type vest and a grey hoodie on the train, leading some to ask if he works for the city
* The NYPD has not yet identified him much less found him and a frantic manhunt is underway
* Videos show the passengers pouring out of the smoke-filled car as it arrived at the 36th Street station
* NYPD units are now searching subway tunnels for the gunman who may have jumped onto the tracks
* There is now severe delays across the entire subway network and many trains have been suspended
The gunman in Tuesday morning's subway horror shooting remains at large, four hours after pulling out a gas mask, detonating a smoke grenade and opening fire on a moving train filled with commuters.
At 8.24am, the gunman - described by witnesses as a 5ft 5 black man, weighing 170lbs, wearing an green construction vest, grey hoodie and gas mask, put on a gas mask on the train and then let off a smoke bomb on the northbound N train as it moved towards 36th Street in Brooklyn.
He then opened fire, shooting ten people - five of whom are now in a critical but stable condition.
When the train pulled into 36th St, the gunman disappeared. He may have fled onto the tracks, prompting NYPD teams to search tunnels as trains were halted, but he remains at large nearly five hours later.
The wounded and terrified commuters poured out of the subway doors and onto the platform at 36th Street.
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New York City Subway Shooting Horror
Live Updates: Suspect at large after 10 shot at Brooklyn subway station -- CNN
Gunman opens fire on Brooklyn subway; at least 10 shot -- AP
At least 16 shot or hurt in NYC by man wearing gas mask, construction vest -- ABC News
10 Shot in Brooklyn Subway Rush-Hour Attack; Manhunt Ongoing for Gunman in Gas Mask -- NBC
Brooklyn subway shooting leaves 16 injured, 'dangerous' suspect at large: officials -- FOX News
Brooklyn subway shooting: 16 injured and five in critical condition -- Axios
6 Injured, 10 Shot In Brooklyn Subway Station Attack; NYPD Says Active Shooter Not A Terrorist -- Zero Hedge