The Alberta Serious Incident Response Team, which reviews serious actions involving police, is investigating.
Shortly before midnight on Thursday, a man banging on the main entrance of the RCMP detachment in Fort Chipewyan was shot and injured by an officer.
According to ASIRT, An officer had responded to the disturbance and a second Mountie who was off-duty saw what was going on and came to help.
Police say it was during an altercation that one of the officers discharged a firearm.
The suspect sustained a non-life-threatening injury and was transferred to hospital for treatment.
Neither officer was hurt.
The Alberta Serious Incident Response Team will investigate the circumstances of the shooting.