New York Police Commissioner Keechant Sewell said at an afternoon press conference that the suspect, a man in a green vest and grey hoodie, donned a gas mask as a Manhattan-bound N train waited to enter the 36th Street station. The suspect deployed at least one gas canister, Sewell said, before opening fire on people aboard the train and on the platform.
Article source: https://www.huffpost.com/entry/brooklyn-subway-multiple-shot_n_62557d8ae4b0e97a35171948