Title: Mass School Shootings: A History - ABC News
Headings: Mass School Shootings: A History
Mass School Shootings: A History
Content: Gunmen Eric Harris, 18, and Dylan Klebold, 17, walked into their school on April 20, 1999, and opened fire, killing 12 of their classmates and a teacher, and injuring 21 more, before turning their firearms on themselves. At the time, it was dubbed the most deadly school shooting in American history, and it changed the way many communities across the country thought about school safety. But then the nation was once again rocked to its core when a gunmen went on a terrorizing rampage at Virginia Tech, almost a decade later. On April 16, 2007, Virginia Tech senior Seung-Hui Cho unleashed a rampage on the college campus, shooting and killing 32 students, and wounding 17 more people. More than a year before the massacre, in December 2005, a district court in Montgomery County, Va., deemed Cho " mentally ill " and "an imminent danger to self and others." The aftermath of the Virginia Tech shooting prompted Congress and President George W. Bush to sign the first major change to U.S. gun laws in more than 10 years -- it expanded the federal background check database -- and overhauled how many campuses handle crime and security alerts. Before these rampages, there were multiple other fatal school shootings. The death toll wasn't as high, but the violence was just as great. This year, on Feb. 27, T.J. Lane, 18, allegedly entered Chardon High School in Ohio with a .22 caliber handgun and a knife. He shot four students in the cafeteria and one in the hallway before walking out, leaving three dead.