I was at Hi-Caliber in Holly Springs this afternoon, testing out my new Hi-Point 9mm carbine. I was on lane 10, which is against the far left wall. There was a large pile of brass against the wall, forward of the firing line. I shot about 90 rounds out of the carbine, and had stopped shooting to reload the last ten rounds. All of a sudden the pile of brass burst into flame. It was shooting up a good 3-4 feet. One of the employees, possibly the owner, came and hit it with a fire extinguisher, which succeeded in putting it out. Then they cleared the range. Supposedly someone had been shooting shotguns earlier (against range rules) which built up enough unburned powder on the range to cause a fire hazard. I suspect that part of the problem was leaving so much brass piled up. Luckily no one was injured and there didn't appear to be any damage to the range.