VIRGINIA TECH SHOOTING

A group of girls visit a memorial on Drill Field, on the campus of Virginia Tech in Blacksburg, Virginia on April 22, 2007. Cho Seung-Hui, a student at Virginia Tech, went on a shooting spree and murdered 32 people on April 16, 2007. It was the deadliest school shooting in U.S. history. (UPI Photo/Kevin Dietsch)