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Timeline of school shooting

April 23, 1999
Web posted at: 10:41 p.m. EDT (0241 GMT)

(CNN) -- The Jefferson County Sheriff's office released the following timeline of events connected with the massacre at Columbine High School in Littleton, Colorado.

TUESDAY April 20 11:21 a.m. -- 911 caller reports explosion in area of West Coal Mine St. and South Wadsworth Blvd. A total of five calls are received.

11:25 a.m. -- Columbine High School custodian tells school resource Deputy Neil Gardner of explosion in southeast parking lot. Additionally, someone reported to be moving toward school carrying what appeared to be a shotgun.

11:26 a.m. -- 911 caller reports injured student lying in south parking lot near south school entrance. Deputy Gardner responds and begins search for armed person.

  • Soon after, Gardner reports engagement in gun battle with one suspect.
  • During the next 10 minutes, more 911 calls report shots being fired and explosions at school.
  • Within three minutes of first 911 call, several more deputies arrive at school, make preliminary assessment and request assistance.
  • Deputies transport wounded students to safe location to await transport to hospitals.
  • Within 20 minutes of initial call, officers from other jurisdictions arrive at school, including tactical officers with SWAT equipment. Multi-jurisdictional team assembled, enters school and begins evacuating students and faculty.
  • Denver Police Department officer exchanges gunfire with at least one suspect.
  • SWAT teams from Arapahoe and Jefferson County Sheriff's offices and police departments of Littleton, Lakewood and Denver arrive.
  • Each team assigned a section of school and begins tactical deployment to rescue anyone trapped in building.

WEDNESDAY April 21 2:00 a.m. -- Numerous sweeps of crime scene completed by SWAT teams to ensure all surviving victims are evacuated and building is safe to begin identification of casualties.

10:30 p.m. All victims identified and bodies removed.

Since then, investigators process and collect evidence. Additional explosive devices found on Thursday, April 22.



CNN INDEPTH SPECIAL:
Are U.S. schools safe?


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DONATIONS FOR COLUMBINE FAMILIES:
The Healing Fund
Mile High United Way

RELATED SITES:
Swedish Hospital (patient conditions)
Littleton Adventist Hospital - Important Phone Numbers
Denver Health Medical Center - Home
APA HelpCenter
Violence Policy Center
  • Fact Sheet on Littleton, Colorado School Shooting
Columbine High School
Jefferson County Sheriff's Office
Jefferson County Public Schools
KUSA
  • Breaking News
Denver Rocky Mountain News: InsideDenver.com
KMGH Denver
  • KMGH Denver: Breaking News
School violence
GUN-FREE SCHOOLS ACT OF 1994
CDC: Facts About Violence Among Youth and Violence in Schools
Violence and Discipline Problems in U.S. Public Schools: 1996-97 / 98-030
The Denver Post Online
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