Columbine Massacre Videos
6 deadliest US school shootings since 1966
A look at the deadliest U.S. school shootings in recent history.
Maryland teen plotting school shooting referred to Columbine , Newtown in diary, police say
A Maryland teen accused of plotting a school shooting mentioned the Columbine High School massacre and the Sandy Hook Elementary School shooting in a diary discovered by investigators, according to authorities.
Index: Police Praise Parent for Helping Prevent Possible Columbine -Style School Attack
ABC News' David Muir reports the stories people have been buzzing about all week.
Two Students Arrested for Alleged High School Shooting Plot
Two 16-year-olds are being held at Orange County Juvenile Hall in California.
Florida Middle School Students Accused of Plotting Columbine -Style Attack
The accused students are being held at a juvenile detention center and potentially face adult charges.
School Massacre Plans Thwarted by Florida Authorities
Two middle school boys allegedly planned to "open fire" in the school's gym, targeting students wearing white shirts.
2 Teens Arrested After Planning Middle School Mass Shooting
Two male teenagers in central Florida were arrested Thursday after authorities discovered the pair's plan for a Columbine-style mass shooting at their middle school, police said.
How Columbine Killers Dylan Klebold , Eric Harris Were Different: Part 2
Experts who have studied the Columbine massacre talk about what set both boys apart and missed warning signs.
Why Columbine Killer's Mother Sue Klebold Came Forward: Part 1
Sue Klebold talks about her relationship with her son Dylan and what she went through during and after the tragedy.
Columbine Shooter's Mother Speaks to Diane Sawyer
Imagine if your satin was responsible for one of the worst mass shootings in American history. Well this is a reality that the mother of Columbine High School killers Dylan people has lived with for the past seventeen years. If she's finally breaking her silence to ABC news anchor Diane Sawyer so