Firefighters are investigating a suspicious morning blaze at an auto shop near Martin Grove Road and Rexdale Boulevard in Rexdale.

Fire crews were called to the business at 77 Racine Rd. shortly after 8 a.m. Monday. When they arrived, crews found an auto shop building on the site engulfed in flames.

Heavy black smoke could be seen drifting from the site, though fire crews say there were no concerns about hazardous materials on the property.

Fifteen fire trucks with 47 firefighters battled the blaze and within an hour, the flames were extinguished.

Firefighters say the entire building was destroyed and the roof partially collapsed.

Chief Bill Boyd calls the fire suspicious and says the Ontario Fire Marshal has been called in to investigate the cause.

No injuries were reported.