 to this investigation chief christopher ray and the investigation which so far has not turned up a motive for the 20 year old gunman in pennsylvania they do say they believe he acted alone big questions though for the secret service obviously how was that gunman able to get on top of the building 150 yards from the stage in pennsylvania the sheriff says a local police officer confronted the shooter and was forced to turn back when the gunman uh again poised that weapon on him