Firefighters from the Pittsburgh Bureau of Fire responded to a one-alarm fire inside the Allegheny Sandwich Shoppe at 822 Western Avenue on the North Side.
When firefighters arrived on scene they discovered a fire that appears to have originated in the electrical room and stayed mostly confined to that space.
There was a significant amount of smoke, but firefighters were able to extinguish the fire quickly, keeping it from spreading.
The business is closed on Sundays. There were no injuries to firefighters or anyone on scene.
The Fire Investigation Unit, made up of investigators from the Pittsburgh Bureau of Fire and detectives from the Pittsburgh Bureau of Police, is investigating the exact cause of the fire.