One of the officers who opened fire Sunday was struck under his armpit by his partner’s bullet and two innocent straphangers were wounded.

Two officers pursued a fare evasion suspect, then opened fire as he approached them, police said. The suspect, one officer and two bystanders were shot.

New York police have defended their actions after a bystander was shot in the head as two officers tackled a fare-evader armed with a knife in a busy subway station. The man was in critical condition after the shooting at Sutter Avenue L station in Brooklyn on Sunday afternoon.

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.

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