VASSALBORO, Maine (NEWS CENTER) -- State Police are investigating the accidental shooting of an Aroostook County corrections officer that happened in a parked truck at the Maine Criminal Justice Academy in Vassalboro.

The vehicle and gun involved in the incident were privately owned. Wounded from the accident was Matthew Morrison, 33, of Mars Hill. Morrison is being treated at Maine Medical Center for a gunshot wound to the leg.

Morrison was shot by a fellow corrections officer, Matthew Benger, 24, of Portland, who works for authorities in Cumberland County. The shooting took place inside a pickup truck owned by yet another corrections officer – Cody Gillis, 25, of Brunswick, who also works for Cumberland County.

The shooting incident happened after the COs were dismissed for the day. Benger was handling a 9mm pistol and shot Morrison as he sat in the back seat before they went out for an errand.

Morrison was taken to Maine General and then flown by LifeFlight to Portland. Morrison will have surgery on the leg as early as Tuesday.

The three men were attending a five-week basic corrections training program at the academy and were most of the way through the program at the time.

Ownership of the gun belongs to Gillis. The Kennebec County DA and Maine State Police will both review a report about the incident in the near future.