The cause of the explosion and the extent of injuries were not immediately known, Peel Regional Police said on Twitter.
Video images showed a flattened and destroyed house while the road and roofs of neighboring houses were strewn with debris.
Police said they had set up a large perimeter and nearby homes were being evacuated. They warned the public to avoid the area.
Four houses have been affected by the explosion, CBC reported, quoting residents as saying they had heard a “loud bang” and felt the ground shake.
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