Toronto fire says that an overnight blaze at a City of Toronto yard building has caused between $5-10 million worth of damage.

The fire started in a maintenance garage near Ellesmere Road and Midland Avenue in Scarborough just before 2 a.m. this morning.

Fire officials say that a city worker at the building was fuelling a vehicle when they heard popping sounds. The same worker then saw flames coming from the building and called 911. 

Firefighters had the fire under control by 3:15 a.m., but were still on scene as of 8:30 a.m. monitoring hot spots in the roof of the building.

Toronto fire says it appears that the fire started in a garbage truck or pickup truck — then spread through the building and the roof.

There were no injuries as a result of the fire.