A Dairy Queen in north Calgary was engulfed in flames Tuesday evening.
Battalion Chief Bruce Barrs said the 911 call first came in at around 5:30 p.m.
Firefighters were still on scene at the ice cream chain at 1906 Centre Street N.E. late into the evening, working to extinguish the blaze.
"Crews were faced with visible smoke and flame," Barrs said, adding that it was later upgraded to a two-alarm fire.
Barrs said the building was empty when crews arrived and there were no injuries reported.
He said investigators are on scene waiting to begin their investigation into the cause of the fire as soon as flames are extinguished.
The building was severely damaged.
Police, ATCO and Enmax were also on scene.
Yang Xie was driving on Centre Street when he saw the road was blocked by firetrucks.
He said he used to live across the street from the restaurant.
"You can probably see the smoke from at least eight blocks away," he said. "It's unfortunate to the owner. It's just sad for the area."
Centre Street N.E. between 19th Avenue and 17th Avenue remained closed as of 10 p.m.