An officer with the St. Clair Shores (MI) Police Department suffered a possible concussion when he was struck by a suspected drunk driver in the early morning hours on Sunday.

According to WWJ Radio, the officer—whose name has not been released—had been called to assist at the scene of a traffic collision when a car slammed into the rear end of his patrol vehicle.

The department said that while the investigation into the crash remains ongoing, initial suspicions are that alcohol was a factor in the incident.