Columbine Massacre Videos
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
Columbine Shooter's Mother Sue Klebold Speaks Out
The mother of Dylan Klebold speaks to Diane Sawyer in an exclusive interview to air today in a special edition of "20/20."
Schools Prepare Students for Emergencies After an Alarming Number of School Shootings
More than 10 fatal school shootings across America this year spark preparation safety drills in the classroom.
What It's Like Inside a School Shooting Drill
Some parents became angry when their children were terrified during a Florida middle school's drill.
Columbine's Chilling Legacy
ABC News' Pierre Thomas examines the trend of Columbine copycats and how a fascination with the killers has created a dangerous subculture.
Parents Sympathize with Father of Santa Barbara Shooter
Act 5: After Peter Rodger's interview with ABC News' "20/20," many shared their opinions on Facebook.
Counselor Thwarts Plan for Massive Shooting at a School in Tennessee
And now we to some encouraging news as you'll remember this week began with a shooting at a high school than the 74 since Newtown. But we end this week with a tragedy averted. And it's all thanks to an alert expert who recognized a dangerous and troubled young man and took action. ABC Stephenson
Alleged School Attack Plot Foiled in Minnesota
Police say John LaDue, 17, was "fully prepared and ready to go" with a violent shooting and bombing spree.