Sebastian Villasenor, 18, allegedly had "over a thousand rounds" of ammunition and 11 weapons, including seven rifles and one ...

People Against Violence Enterprises was established after the Columbine High School massacre in Colorado in 1999.

It has been nearly 20 years since the first mass school shooting in the U.S. -- the shocking tragedy at Columbine High School in Littleton, Colorado, on April 20, 1999. As a “credible” threat ...

And much of it can be traced back to the two killers at Columbine, previously ordinary high school students who have achieved dark folk hero status — their followers often known as ...

July 25 - As the mother of one of only 16 African-American students at Columbine High School, Tammy Theus waited in terror for six hours after hearing that a black ...

Rachel Joy Scott’s death made the news. As the first student killed in the 1999 shooting at Columbine High School, Scott’s name and face was broadcast around the world as news outlets ...

April 20 marked the 25th anniversary of the Columbine High School shooting in Colorado, where a pair of gunmen killed 12 students and a teacher before taking their own lives. The attack remains ...

Nearly 20 years separate the horrible tragedies at Columbine High School in Colorado and Stoneman Douglas High School in Parkland, Florida. In that time, too little has been done to make our ...

The tracker focuses on the segment of planned school shootings where an active shooter, with intent to harm, injures or kills at least one student or faculty member during school or at a school event.

A rose stands at the plaque for Corey DePooter, one of the 12 student victims in the massacre at Columbine High School, at the Columbine Memorial on Wednesday in Littleton, Colo. The Associated ...

May 30 - While teacher Dave Sanders lay bleeding to death for four hours inside Columbine High School, a 911 dispatcher got minute-by-minute updates over a school phone about his dire condition.