Taylor Bros. Concrete, on the outskirts of Saskatoon, suffered heavy damage following a fire on Nov. 21. (Dan Zakreski/CBC)

A fire that gutted a Saskatoon area concrete business last Saturday was likely caused by an electrical malfunction or a furnace problem, officials say.

Investigators from the provincial fire commissioner's office, with assistance from the Saskatoon Fire Department, said Thursday that the fire at Taylor Bros. Concrete on Nov. 21 was probably accidental.

"[T]he area of origin of the fire was located at the southeast end of the shop," the fire commissioner's office reported in a news release. "The two credible sources of ignition in this area were electrical and a natural gas forced-air furnace. The possible cause is accidental and no evidence of foul play was found."

The fire, which broke out in the early morning hours, consumed a production plant, business office and a number of expensive delivery trucks.

There were no injuries in the blaze.

The investigators added that a police report suggesting a door to the building had been broken down was not correct.

"The door to the building had been breached by firefighters in an attempt to secure a source of water for fire suppression," the commissioner's office said.