At least 28 people were injured, 10 of them shot, and the gunman is still on the loose after a New York City subway attack during the Tuesday morning rush hour commute, according to Empire State officials.
The suspect is considered "dangerous" more than four hours after police first responded to the incident in Sunset Park, Brooklyn, New York Gov. Kathy Hochul said in a press conference, advising residents to remain vigilant.
"This is an active shooter situation in the city of New York," Hochul said. "We ask everyone to be careful, be cautious, report what you see."
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The subway attack is not being investigated as terrorism, New York City Police Commissioner Keechant Sewell said at the press conference, later noting that nothing was ruled out, as the suspect's motive is still under investigation.
The incident began as the train was en route to the 36th Street station just before 8:30 a.m., officials said. The assailant put on a gas mask moments before opening a canister from his bag, filling the train with smoke. The suspect then opened fire, striking multiple people in the subway car and on the platform, according to Sewell.
The suspect has been described as a black male approximately 5-foot, 5-inches tall, wearing a green construction-type vest and a gray hooded sweatshirt.
The wounded were taken to area hospitals, where officials reported 28 people with injuries, according to Fox News roughly an hour after the press conference. Five of them were in critical condition. Some of the injuries were due to smoke inhalation and shrapnel at the scene, while others were likely caused by the panic following the incident, First Deputy Commissioner Laura Kavanagh of the New York City Fire Department said at the press conference.
Police first responded to multiple reports of a shooting at the station, where "several undetonated devices" were found, the fire department told CNN. Police later confirmed that no active explosive devices were found at the scene.
Videos posted to social media show the train pulling into the station and opening its doors before smoke billows out and people frantically exit onto the platform. Some photos show a number of people bloodied and on the ground.
A disturbing video from the scene of a Brooklyn subway where this shooting incident unfolded, from police sources https://t.co/kuZ61EtdPC pic.twitter.com/BAExwXUwza
— Craig McCarthy (@createcraig) April 12, 2022
Footage outside the station showed a massive police and fire presence.
#BREAKING: Reports of shooting, explosion inside Brooklyn subway station; several injured pic.twitter.com/D6YwZvSte6
— Amichai Stein (@AmichaiStein1) April 12, 2022
An investigation into the attack is ongoing, and residents are advised to avoid the area of 36th Street and Fourth Avenue in Brooklyn.
Subway service on several lines in Brooklyn and some stations in Manhattan has been suspended, and several schools in the area are under a shelter-in-place order as the manhunt continues.
"On 9/11, I stood on Fourth Avenue and watched people, New Yorkers, come back from that tragedy. I watched New Yorkers help each other," New York City Transit CEO Janno Lieber said during the press conference. "That was the same thing we saw on the platform today. We saw New Yorkers in a difficult situation, in an emergency, helping each other."

New York City Mayor Eric Adams, who is isolating after testing positive for COVID-19, said he is monitoring the situation.
"We will not allow New Yorkers to be terrorized, even by a single individual. The NYPD is searching for the suspect at large, and we will find him," Adams said in a video message posted on his Twitter.
President Joe Biden has also been briefed on the situation from the White House.
"President Biden has been briefed on the latest developments regarding the New York City subway shooting. White House senior staff are in touch with Mayor Adams and Police Commissioner Sewell to offer any assistance as needed," the White House said.
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"This morning, ordinary New Yorkers woke up in anticipation of a relatively normal day," Hochul said during the press conference. "Tranquility and normalness was disrupted, brutally disrupted, by an individual so cold-hearted and depraved of heart that they had no caring about the individuals that they assaulted as they simply went about their daily lives."