Fire officials remain on the scene of an early morning fire in Owen Sound.

The fire department responded around 4 a.m. Monday morning to a multi-unit residence on 6th Avenue East.  When they arrived the building was engulfed in flames.

The building was believed to be vacant, but authorities have not been able to confirm that no one was inside at the time of the fire.

The fire has been deemed suspicious and the Ontario Fire Marshal’s will be investigating.