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9 months ago
(11:10) Klebold and Harris arrive at Columbine High School
(11:14) The gunmen dressed in black trench- coats carry two duffel bags filled with 20 pound propane bombs into the cafeteria
(11:19) the Jefferson County Dispatch Center received a 911 call from a person who reported hearing an explosion in a field on the east side of Wadsworth Boulevard which was a diversion bomb placed by the gunmen
(11:20) Tired of waiting for the explosions the gunmen begin their shooting spree
(11:22) The school custodian set the surveilance camera back to record
(11:23) A 911 call from a student at Columbine at reported a female fallen in the south parking lot and that she might be paralyzed
(11:24) William Sanders and two custodians entered the cafeteria to see what was happening outside
(11:25) Patti Nielson had made it to the checkout desk in the school's library and frantically placed a 911 call as she tried to get the students in the library to hide under the tables
(11:26) Deputy Neil Gardner radioed for backup telling dispatch "Shots in the building. I need someone in the south lot with me."
(11:27) Deputy Neil Gardner radioed in a Code 33 which was officer needs emergency assistance
(11:29) Eric Harris and Dylan Klebold entered the library hollering for everyone in the large room to get up
(11:30) dispatch reported possible shots in the Columbine High library.
(11:34) The shooters moved to the center of the library where they reloaded their weapons at a table midway across the room
(11:36) The gunmen leave the library
(11:38) They threw several more pipe bombs down to the cafeteria below
(11:44) Eric and Dylan headed down to the cafeteria
(11:46) The shooter head back upstairs to the cafeteria
(11:49) The shooters headed to the main office area where unarmed security guard and a secretary were hiding
(11:53) Eric and Dylan moved from the offices to the art hall
From 12:02 to 12:05 Eric and Dylan were shooting out of the broken windows in the library at the police
Because of the noise of cover fire from law enforcement outside, none of them were able to say later when exactly Eric Harris and Dylan Klebold shot themselves but after 12:05 no shots attributed to the killers were fired
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