Update (1241ET): Updates from the press conference on the Brooklyn subway shooting: 

16 people were treated for injuries

10 have gunshot wounds

5 people are in critical condition

The suspect is a 5'5" tall Black male with a heavy build, wearing a green construction-type vest and a gray hooded sweatshirt. 

NYPD Police Commissioner Keechant Sewell said the incident occurred around 0830 ET on the Manhattan-bound N-train when "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. The train at that time began to fill with smoke."

Sewell said the suspect then "opened fire, striking multiple people on the subway and in the platform."

NYPD says the suspect is still on the run. Police aren't investigating the incident as an act of terrorism at this time. 

Gov. Kathy Hochul said, "this is an -shooter situation right now."

Update (1054ET): White House press secretary Jen Psaki tweeted President Biden has been briefed on the latest developments in Brooklyn's shooting incident.