Crews were fighting a large industrial fire near Toronto Pearson Airport on Tuesday morning.
The three-alarm fire is at Disco Road and Carlingview Drive, near Highway 427 in Etobicoke, Toronto Fire said just after 5:30 a.m. The fire was later upgraded to a four-alarm blaze.
The fire broke out at 3:45 a.m. at a private waste transfer station, which handles construction waste, reports indicate.
Toronto Fire Commander John Carson told reporters that crews are expected to remain on scene throughout the day as the fire is burning deep into construction materials.
As of around 7:30 a.m., the fire was under control, Carson said. Crews cut a hole in the roof to extinguish the fire, he said.
No injuries have been reported.
Large amounts of smoke are in the area, possibly affecting visibility on Highway 427, police said.
Police asked people to use extreme caution when driving in the area.
There are road closures on Disco Road between Carlingview Drive and Highway 427. Atwell Drive is also closed.
Officials are expected to provide an update on the fire this morning.

The fire broke out in the Disco Road and Carlingview Drive area of Etobicoke on Tuesday morning. Map: Google Maps
This is the second fire at the facility.
In October, more than 100 firefighters battled an overnight blaze at the same waste management station at Disco Road and Carlingview Drive.
The city’s Disco Road Transfer Station is also in this area.
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