No injuries were reported following a three-alarm blaze at a vacant retail building in downtown Toronto.
Fire crews responded to the scene around 11 p.m. Monday on Yonge Street just south of Wellesley Street.
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Toronto fire officials said the blaze was contained to a three-storey building under renovation.
Deputy Fire Chief Jim Jessop said the roof of the building collapsed but no injuries were reported.
Authorities do not believe the fire is suspicious and that preliminary investigation results indicate the blaze started on the main floor and spread up the wall assembly into the attic space.
The estimated cost of the damage is unknown.