Tourists and gunfire

I'm still going back and forth to middle-of-nowhere Pennsylvania for work. The travel is already old, but the money is good. Stopped at a rest stop on I-80, and heard gunfire--Spaced out with a second or two between shots, rather than gunfight or Hollywood rate of fire. I thought "must be a gun range behind those woods...wonder how often it freaks out the tourists" A couple minutes later, I overheard an older looking guy on his cellphone calling 911 to tell them about the gunfire. A worker at the rest stop was walking by and told him there is a range behind the woods. There were only a couple of vehicles in the parking lot, and I'm pretty sure his was the one with New Jersey plates...