Sarnia police are investigating an early morning break and enter to Brownstones Restaurant at Wellington Street and Finch Drive.
At least five cruisers responded to an alarm call at around 5:52 a.m. Tuesday morning.
Staff Sgt. Mike Van Sickle said the glass door on the west side of the building was smashed.
He said it's unclear if anything was stolen, and said the suspect fled before police arrived.
The investigation is ongoing.