Investigators are looking at arson as the possible cause of two fires in a North York industrial zone early Wednesday morning.

The Office of the Fire Marshal is investigating the fires, which occurred in a parked tractor-trailer and a commercial building on Flint Road, near Dufferin Street and Finch Avenue West.

Firefighters quickly extinguished the flames after they arrived on scene at about 3:20 a.m.

Police spokesman Const. Tony Vella said emergency personnel were notified when a burglar alarm was triggered.

No injuries were reported.