Two firefighters were injured and Toronto Fire issued a mayday call as crews battled a fire in the west end.
It began at a townhouse on Perth Avenue, near Dupont Street and Lansdowne Avenue, around 8 a.m. on Wednesday. The fire later spread to a neighbouring townhouse.
One firefighter was taken to hospital with minor injuries to her leg and the second was treated at the scene. The mayday alert ended once the firefighters were removed from the home.
Early reports indicate part of the floor had collapsed and the firefighters fell through the floor. A third firefighter, the captain, also fell but was able to hold on to a remaining portion of the floor. The two firefighters below were able to free themselves from the debris and hold on to the captain and climb up.
The woman who lives in the home was at work when the fire began.
Hoarding may have been a factor in the blaze, Toronto Fire said.
Toronto Fire said at least 13 trucks and 50 firefighters were involved.
All the fire hydrants in the area were working.
With files from Shauna Hunt