Chattanooga firefighters responded to a commercial fire that broke out around 9 tonight at Zeco Inc., 4146 South Creek Road, just off Amnicola Highway.
Roughly half a dozen firetrucks clustered around the scene. Police officers blocked off all roads in the area, and the smoke was visible from the highway.
Firefighters were still actively fighting the fire at 10 p.m. No injuries were reported and the building was empty when the fire started, said Bruce Garner, fire department spokesman.
One witness reported hearing a boom and seeing a fireball.
Firefighters will be investigating the cause of the fire.