The Ontario Fire Marshal is investigating a blaze in the Glen Cairn area of London.
Shortly after 5:00 a.m. Saturday, emergency crews were called to 352 Westlake St.
A resident of the building contacted emergency services on a pay phone outside.
All occupants were evacuated from the building.
One resident was transported to hospital for treatment of minor injuries.
Emergency Management London has set up temporary shelter for the displaced occupants of the building.
Police say the incident is not considered to be suspicious but the investigation continues.
