NEW YORK — Authorities investigating Plaxico Burress' accidental shooting say they are looking into what roles his teammate Antonio Pierce and the hospital that treated Burress played in the incident.

The New York Giants star wide receiver turned himself in to police to face weapons possession charges Monday.

Burress accidentally shot himself at a Manhattan nightclub Friday evening and was treated at NewYork-Presbyterian Hospital/Weill Cornell Medical Center. He was released Saturday.

Lawyer Benjamin Brafman says Burress plans to plead not guilty to a weapon possession charge during a Monday afternoon court appearance.

Police, meanwhile, were investigating whether the hospital failed to report the shooting and were trying to speak to Pierce, a linebacker for the Giants.