Firefighters believe a blaze at an old bingo hall in the city's east end was likely an act of vandalism.
Firefighters say the abandoned building at 1750 St. Laurent Boulevard was not secure when they arrived on scene.
Thirty firefighters responded to the blaze just after midnight and managed to contain the fire to the building's office. The fire was under control within 40 minutes.
The cause of the fire remains under investigation. Damage is estimated at about $5,000.