A gunman walked into a Bridgeville, Pa., health club tonight, turned out the lights and opened fire, witnesses of the shocking attack said.
The shooting left four people dead -- including the shooter, a law enforcement source told ABC News radio. Up to 15 others have been reported injured.
At a press conference Tuesday night, Allegheny County police Superintendent Charles Moffatt said that three women and one man were among the dead.
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