Columbine High School was the site of one of the deadliest mass shootings in modern United States history . The shootings occurred on April 20 , 1999 , when senior students Eric Harris and Dylan Klebold killed twelve students and a teacher , and wounded 24 others , before they both committed suicide . The massacre made headlines both nationally and internationally , making Columbine a household name , and causing a moral panic in U.S. high schools . It was the deadliest high school shooting in U.S. history until February 14 , 2018 , when 17 people were killed in the Stoneman Douglas High School shooting
Stoneman Douglas High School shooting
Stoneman Douglas High School shooting
Columbine High School