The cause is listed as accidental after a fire in the upper floor of a duplex in Ford City.
Crews were called to 1709 Drouillard Rd at Alice St at around 11am Monday and had the flames out quickly.
An overloaded electrical circuit is getting the blame for the fire which caused $110,000 in damage.
Those who were home at the time were able to get out safely, but four people have been left homeless.
A firefighter suffered a cut to the hand while battling the blaze, he was treated on scene.
Meantime, crews are also investigating the cause of a separate fire at another duplex.
Firefighters were called around 2am to 465 Crawford Ave near University Ave W for the blaze.
No other information has been released about that fire.