From Jenna Orkin In an exclusive interview, former Secret Service Director Julia Pierson told USA TODAY that maintaining such a sniper security perimeter is part of the agency's responsibility for safeguarding protectees like Trump from harm. She said agents typically consider 1,000 yards to be the minimum safe distance for sniper attacks. Former classmate of Trump rally gunman says he was ‘bullied almost every day’ Once Banned, Now Loved and Loathed: How the AR-15 Became ‘America’s Rifle’ Rifle used in Trump assassination attempt belonged to shooter Thomas Matthew Crooks’ father: report Here's what we know about Thomas Matthew Crooks, the suspected Trump rally shooter What we know about the alleged gunman behind Trump shooting Law enforcement sources told CBS News the suspect was shooting with AR-style rifle from 200-300 feet away. The gunman was on top of a shed outside the security perimeter set up by the Secret Service, law enforcement sources said. Rep. Ronny Jackson nephew injured in Trump rally shooting: What We Know The gunman was outside of the cordoned-off rally area about 200 to 300 feet from the rally, and was standing on an elevated structure believed to be a shed, the two sources said. The shooter was armed with an AR-style rifle, sources said.... It is still being determined if Trump was struck by a bullet or debris, a law enforcement source said. Juvenile Crimes - Chapter 35 Everyone Fighting Their Way Forward WESLEY T. MILLER