Updated: August 15, 2012
On April 20, 1999, the worst incidence of school violence in U.S. history occurred at Columbine High School in Littleton, Colorado. Two heavily armed students, Eric Harris and Dylan Klebold, killed 13 people and wounded 23 before taking their own lives.
If you know about a weapon threat at school, don't delay -- tell an adult you trust or call the toll-free number 1 (866) SPEAK UP, a nationwide anonymous hotline operated by the anti-gun violence group PAX.
See photos from anniversary memorials of the Columbine High School shootings and remember to call to report a weapons threat.
Sources: American Psychological Association, Focus Adolescent Services
Gain an understanding of the tragedy and remember the students lost in the school shooting.
Current Columbine students share what impact the events of 10 years ago has had on them.
Get the facts on the Columbine High School shooting in Littleton, Colorado.
Steven Fabian visits Colorado for updates about Columbine High School and the survivors.
Read a summary of a U.S. Secret Service safe school initiative report, to better understand how to stop campus shooting before they start.
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