The investigation continues after a late Friday night fire destroyed two homes on Parkview Drive in Strathroy.
The Strathroy-Caradoc Fire Department said it responded to a fire in a garage around 11:30 p.m.
The garage was fully engulfed by the time firefighters arrived but then spread through the attic of a single-family home. It then breached the roof and spread to the house next door.
Some media reports said the fire caused over $1-million dollars damage.
The occupants at the two homes were not injured, but two firefighters suffered minor injuries during the fight to contain the fire.