Atlanta police are investigating after an off-duty officer fired shots outside a midtown concert venue.

Police said an event at Center Stage on West Peachtree Street had just ended around 11 p.m. when the officer, who was working the event, saw someone firing gunshots toward a group of people. Police said the officer confronted the gunman and fired several shots, but they were able to get into a car and flee.

Shortly after the exchange, a man went to Grady with a gunshot wound to his leg, which he said occurred as he was leaving Center Stage, police said. It is not clear who shot him.

Police are looking into whether an altercation between two groups inside the venue could be connected.

The officer has been placed on routine administrative leave.