Authorities said the suspect, who remains at large, put on a gas mask, deployed a gas canister and then began shooting
The attack is not being investigated as an act of terrorism but authorities have not ruled anything out, the NYPD commissioner said
Investigators have cell phone video from an eyewitness to the Brooklyn subway shooting that shows the suspect, a law enforcement source tells CNN
The shooting suspect is still at large, officials say, and a manhunt is underway for a subway passenger who put on a gas mask
The shooter, who fled the scene, was described as a 5-foot-5-inch Black man with a heavy build wearing a green construction vest and a gray hooded sweatshirt
The FBI is working with the NYPD on the investigation and is following "every viable lead," said Michael J. Driscoll, Assistant Director in Charge of the FBI New York Field Office
On Tuesday morning, Durant was asked about the impact of the shooting