6 dead, several more wounded in mass shooting at Collier gym - Pittsburgh Tribune-Review At least six people were killed and several others wounded tonight when a gunman walked into a fitness center in the Great Southern Shopping Center in Collier and opened fire. An Allegheny County policeman said he believes one of the dead was the gunman. Witnesses said they saw two to four wounded women lying outside the back door and two others lying in a parking lot at the side of the LA Fitness center along Washington Pike. Witnesses said a gunman wearing a black hat walked into an aerobics room filled with women shortly after 8 p.m., turned out the lights and opened fire. Witnesses reported hearing dozens of gunshots before the shooting stopped. "All of a sudden there was a really loud noise," said Julia Zorzi, 27, of Crafton, who was on a treadmill on the main floor when the gunfire began. "I heard 40 to 50 shots, and I hit the deck. I saw people running out. I ran outside and there were two girls lying outside. "The shots came very fast," she said. "It sounded like he was using a serious piece of machinery." Police and paramedics from throughout the South Hills and Pittsburgh responded to the shootings shortly after 8 p.m. A St. Clair Hospital spokesperson put the death toll at six, including the gunman.