Tucson Fire Department crews fought a fire at an 8,000-square-foot building on the city's east side Sept. 11, 2017. There were no injuries in the blaze, said fire Capt. Andy Skaggs.

Courtesy Tucson Fire Department

Tucson firefighters knocked down a fire in an 8,000-square-foot building on the city's east side Monday night.

No one was injured in the Sept. 11 fire in the 1000 block of North Huntington Park Drive, which is south of East Speedway and west of North Camino Seco.

The fire was reported shortly before 6 p.m. by multiple 911-callers reporting black smoke coming from the structure, which was being used as storage, said Capt. Andy Skaggs of the Tucson Fire Department.

Crews battled the fire mostly from the exterior of the building until it was safe to enter. Firefighters saw smoke coming from an air-conditioning unit on the roof, and later noticed a unit leaning into the roof with the potential of falling through, creating a hazard for firefighters, Skaggs said.

Firefighters inside the building retreated and crews set up large hose streams and fought the fire from outside. Once the bulk of the fire was knocked down and the smoke cleared, firefighters re-entered the building and put out hot spots, Skaggs said.

Thirty-four firefighters brought the blaze under control in nearly 90 minutes.

Investigators remained on scene last night trying to determine the cause of the fire. A damage estimate was not known, Skaggs said.

Contact reporter Carmen Duarte at cduarte@tucson.com or 573-4104. On Twitter: @cduartestar