The Okotoks Fire Department responded to a call around 7:30 a.m. Tuesday, October 16 as a fire ignited inside at the Taco Del Mar Restaurant on Southridge Drive.
A passerby saw flames inside the building and reported the sighting to the RCMP.
Firefighters were able to quickly extinguish the fire but not before it caused significant damage to the interior kitchen area.
No firefighters or staff members were harmed in the blaze.
Okotoks Fire Chief Ken Thevenot says the fire is under investigation.
"The fire right now is under investigation, we have investigators on scene with the RCMP. The fire does appear to be suspicious at this time."
No information has been released regarding what may have caused the fire.
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