A three-alarm blaze at S.B. Cox Inc. was brought under control this morning but city fire officials remained concerned about possible pollution from a pile of smoldering truck tires.

Several dozen tires stored outside caught fire when the blaze struck the large steel storage shed that housed equipment, supplies and several trucks, said Richmond, VA fire Lt. Shawn L. Jones

There were no injuries in the fire that was reported at 3:23 a.m.

The first crews on scene found heavy fire and heard small explosions coming from the structure.

Once it was determined that there were storage tanks on site for acetylene, which is used in welding torches, Richmond firefighters called for more crews from the city as well as Henrico.

Crews concentrated on first moving the tanks for the flammable acetylene away from the burning building.