INDIANAPOLIS -- Police have released a picture of a person they believe was involved in an outdoor shooting that left a man with a gunshot wound Tuesday on the city's east side.

Authorities say they're looking for the pictured male, saying he and perhaps others were involved in a barrage of gunfire during which Matthew Pittman, 23, was wounded.

A witness told police about 18 to 20 shots were fired at about 5:15 p.m. Tuesday in the 2900 block of East 18th Street. It wasn't clear how many people were involved.

Police went to the scene but didn't find anyone shot. About 10 minutes later, police learned that Pittman was at Methodist Hospital, suffering from a gunshot wound.

Pittman told police he was driving a van on 18th Street when someone shot him. Police said the van is damaged but that the damage isn't consistent with Pittman's account of how he was shot.

Police obtained a picture of a male holding a rifle, and a witness told police that the picture was taken shortly before the shooting began. Police didn't say who took that picture.

Authorities said the pictured weapon is a .223-caliber semiautomatic rifle, which fires bullets. Police said Pittman was wounded not by a bullet, but by shotgun ammunition.

Police said they found several .223-caliber shell casings at the shooting scene. At least one other vehicle was damaged by a stray bullet, police said.

Officials asked anyone with information about the person in the picture or the shooting to call them at 317-327-3733.