Footage of two New York City police officers opening fire at a subway station as they confronted a man holding a knife shows they fired at him as he was standing still, his arms by his side and his back to a train.

Police say that a man suspected of not paying the subway fare did not follow instructions and threatened officers with a knife.

Police officials shared more details about the Brownsville, Brooklyn subway station shooting during a Wednesday evening news conference. They said the violence, captured on body-worn cameras and 15 surveillance cameras at the station and on the trains, began when a man accused of fare evasion later charged at police with a knife.