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.

There are new details on Sunday's police shooting on a Brooklyn subway platform that injured four people, including an NYPD officer and two civilians. CBS News New York learned on Monday a bystander took a knife that was at the scene that police said the suspect was wielding at the time he was shot by officers.

Four people were injured Sunday afternoon at a Brooklyn subway stop in what started as officers' attempts to apprehend a man accused of skipping the station turnstile.