"Something was knocked onto a heater," according to police.
Guelph police media relations coordinator Scott Tracey told Narcity that they received a call at 9:53 a.m. on. Sunday "about a possible fire inside the Canadian Tire store."
Police arrived on the scene at 10 Woodlawn Road East "three minutes later at 9:56 a.m., and the fire was visible in the front entrance."
Police say the blaze appears to be accidental, and they believe "something was knocked onto a heater inside the store which caught fire."
The store was evacuated, and "the fire was put out fairly quickly by Guelph Fire Department," according to police.
A video of the fire posted to Facebook shows the blaze burning towards the front of the store as an alarm blasts and smoke pools towards the ceiling.