The fire with three alarms was first reported around 3:40 p.m. at a company near Racine Road and Brydon Drive, close to Kipling Avenue and Rexdale Avenue.
The Toronto fire says there are about 40 propane tanks on the spot and all units are advised to fight the fire from a defensive position.
A headquarters has been set up in the area.
“This is a very active scene. The scene of the fire and the explosion seems to change every minute. “We are being evacuated by emergency services and we are encouraging everyone to stay away from the area as we try to help evacuate local businesses,” Toronto police said. Alex Lee told CP24. “The good news at the moment is that we have not reported any injuries and we would like to keep it that way. So avoid the area.”
About 30 different devices and 100 firefighters are currently at the scene.
Racine Road is closed between Martin Grove Street and Kipling Avenue.