Four people were sent to hospital after a two-alarm fire broke out at an apartment building in the Moss Park area on Wednesday.
Toronto Fire District Chief Stephan Powell told the Star that fire crews responded to the blaze at 285 Shuter St., just before 12:30 p.m.
Powell said a mattress caught on fire on the 12th floor of the building and created a lot of smoke.
Four people were taken to hospital and treated for smoke inhalation.
Toronto fire said the blaze has now been extinguished.
Crews are continuing to investigate to determine the cause.