Fire caused an estimated $20,000 in damage to a Fargo business.

Fire caused an estimated $20,000 in damage to a Fargo business.

Fire officials say the blaze at AutoZone started in a sign attached to the building, shortly before 8 a.m. Tuesday. Flames spread to the building's roof, and firefighters had to remove part of the roof and a wall to make sure the blaze was completely extinguished.

One firefighter suffered what officials said was a minor heat-related injury.

The cause of the fire was not immediately determined.