A fire tore through an auto repair shop in the 800 block of West Grant Road late Wednesday, requiring a two-alarm response from the Tucson Fire Department.
The cause of a fire that engulfed the business, Precision Engineering, is under investigation, according to the department.
Calls were made to 911 before midnight reporting the fire.
When fire units arrived, they reported heavy black smoke pouring from the shop, a news release said.
Crews forced their way into a front door to search the building and begin extinguishing the flames, but the commanding officer decided to fight the fire from outside because of the amount of fire that had come through the roof and appeared to be above the firefighters.
Fifteen units and more than 40 firefighters were sent to the scene.
The origin of the fire is under investigation, with no determination made yet as to a damage estimate, TFD spokesman Barrett Baker said.