This is the first image of an explosion which is understood to have badly damaged a house in Tinsley.
Police say initial information indicates that gas is the source of the explosion on Dundas Road.
People working nearby or driving past the scene this morning say the blast blew debris into nearby businesses and taken off the roof of a house.
Four fire engines are also in attendance and the street has been evacuated.
Reports suggest two houses have been affected, no serious injuries have been reported so far.
A number of roads are affected in the area, including Dundas Road, St Lawrence Road, Town Street and Norborough Road.
The incident was reported at just past 9am.
Check here for updates on this story.