In a special edition of “20/20,” Diane Sawyer speaks with Sue Klebold, Columbine
killer Dylan Klebold's mother. The numbers that follow are a
part of a larger conversation about school violence and children in
crisis:
50 – The number of mass murders or attempted mass murders at a school since Columbine. (FBI records)
141 – The number of people killed in a mass murder or attempted mass murder at a school since Columbine. (FBI records)
73 – The percentage of school shooters with no prior criminal record, not even an arrest. (U.S. Secret Service, U.S. Department of Education)
96 – The percentage of school shooters who are male. (FBI records)
17 – The number of kids aged 15 or younger who have committed or attempted a mass school shooting since Columbine. (FBI records)
81 – The percentage of school shootings where someone had information that the attacker was thinking about or
planning the shooting. (U.S. Secret Service, U.S. Department of
Education)
68 – The percentage of school shooters who got their guns from relatives or at home. (US Secret Service, US Department of Education)
65 - The number of school shooters and thwarted school
shooters who have referenced Columbine as a motivation. (ABC News
investigation, various law enforcement agencies)
270 – The number of shootings of any kind at a school since Columbine. (ABC News review of reported cases)
1 – The number of shootings per week, on average, on a school or college campus in 2015. (ABC News review of reported cases)
http://abcnews.go.com/US/school-shootings-columbine-numbers/story?id=36833245