[Update] Teachers were asked if any of the culprits had been suffering from bullying at school: some of them answered affirmatively. Investigators said they speculated that Harris and Klebold had carried out the shooting as retaliation for being bullied.
[Update] Investigators asked some other teachers how long the shooting had lasted. They said the pair had killed 12 students and had wounded other 20 by approximately 11.35 a.m, that before committing suicide shortly after 12:00 p.m (around 45 minutes since it had started)
[Update] The police asked some teachers whether they had noticed any “weird” behavior from the culprits the days before today: the answers were all negative. They said both students had seemed “normal”.
[Update] Teachers were asked what time had been when the shooting had started: they said both culprits, Dylan and Eric, had begun shooting fellow students at approximately 11:19 a.m
[UPDATE, 12:25 p.m] Investigators said they had found two duffel bags, each containing a 20-pound propane bomb, that had been set to explode at 11:17 a.m in the cafeteria.
Breaking News! [April 20, 1999]
The Littleton police department received a call from one Columbine High School teacher asking for help after two students began shooting inside the school located in Denver, Colorado.