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 ...

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 ...

was photographed wearing a shirt identical to one worn by Columbine killer Eric Harris. Rupnow, who killed a teacher and a student before taking her own life, wore a black shirt featuring the ...