A total of 140 firefighters responded to a five-alarm fire in downtown Montreal on Saturday.
The blaze gutted the residential building and left 20 people homeless.
Firefighters worked from 10 a.m. until 1:45 p.m. to extinguish the fire.
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Montreal Fire Department chief of operations Benoit Martelle told Global News that the fire was believed to be accidental.
Martelle said the fire started, possibly with a thermostat, on the fourth and last floor of the building.
The 100-year-old building was renovated and had two ceilings which, paired up with the low temperatures, made it more difficult for firefighters to control.
Damages are estimated at $100,000.
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