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=== Explosives === In addition to the firearms, the complex and highly planned attack involved several [[improvised explosive devices]]. Harris and Klebold constructed a total of 99 bombs.<ref name="bombsum">{{cite web |series=Columbine Report |publisher=Sheriff's Office, Jefferson County, Colorado |via=CNN |date=May 15, 2000 |url=http://edition.cnn.com/SPECIALS/2000/columbine.cd/Pages/BOMBS_TEXT.htm |title=Bomb Summary |archive-url=https://web.archive.org/web/20160218120916/http://edition.cnn.com/SPECIALS/2000/columbine.cd/Pages/BOMBS_TEXT.htm |archive-date=February 18, 2016 |url-status=dead |access-date=April 15, 2015}}</ref> These included [[pipe bomb]]s, [[Powerlet|carbon-dioxide cartridges]] filled with [[gunpowder]] (called "crickets"<ref>{{cite web |url=https://slate.com/news-and-politics/2009/04/columbine-killer-eric-harris-plans-the-massacre.html |title=Columbine killer Eric Harris plans the massacre |last=Cullen |first=Dave |date=April 16, 2009 |magazine=[[Slate (magazine)|Slate]] |access-date=October 16, 2018 |ref=none}}</ref>), [[Molotov cocktails]], and [[Propane|propane tanks]] converted to [[propane bomb|bombs]]. The propane bombs were used in the cafeteria, the shooters' cars, and in another location intended as a diversion. For ignition, they used storm matches, cannon fuses, and [[model rocket]] igniters as well as [[Time bomb|timing devices]] built from mechanical alarm clocks for the propane bombs.<ref>{{cite web |url=https://schoolshooters.info/sites/default/files/Columbine_report_Homeland_Security.pdf |title=Wanton Violence at Columbine High School |page=27}}</ref> During the massacre, they carried match strikers taped to their forearms for easy ignition of the pipe bombs and {{CO2}} bombs. Harris also experimented with [[napalm]], and envisioned a kind of backpack and [[flamethrower]]. They both attempted to get another friend and coworker, Chris Morris, who was a part of the Trench Coat Mafia, to keep the napalm at his house, but he refused. Harris also tried to recruit him to be a third shooter but played it off as a joke when rebuked.<ref>{{Harvnb|Cullen|2009|pp=330β331}}</ref> ==== Pipe bombs ==== Harris's website contained instructions on making pipe bombs and Molotovs, and the extensive use of [[Fragmentation (weaponry)|shrapnel]].<ref name=guard/> Harris's father once discovered one of his pipe bombs.<ref>{{Harvnb|Kass|2009|pp=159β161}}</ref> Harris's journal logged the creation of 25 pipe bombs.<ref name=bombsum /> Klebold scared his coworkers by once bringing a pipe bomb into work.<ref name=Fatal /> They would give various nicknames to their pipe bombs. After the massacre, two pipe bombs had been left in Klebold's bedroom, one named "Vengeance" and another "[[Atlanta]]", presumably after the [[Centennial Olympic Park bombing|Olympic Park bombing]].<ref name=bombsum /><ref>{{Harvnb|Kass|2009|p=66}}</ref><ref>{{cite web |url=http://www.acolumbinesite.com/evidence/ev3.jpg |title=Index of Evidence Released |website=acolumbinesite.com}}</ref> ====Cafeteria bombs==== They had in their possession eight propane tanks all converted into bombs. The weekend before the shooting, Harris and Klebold bought two propane tanks and other supplies from a hardware store. They bought six propane tanks on the morning of the attack.<ref>{{Harvnb|Cullen|2009|p=40}}</ref> Harris was caught on a [[Texaco]] gas station security camera at 9:12 a.m. buying a [[Blue Rhino]] propane tank.<ref>{{Harvnb|KrabbΓ©|2012|p=295}}</ref> Both cafeteria bombs included a single 20-pound tank, attached pipe bombs, and supporting gasoline canisters alongside.<ref name="guidebomb">{{cite web |url=https://www.columbine-guide.com/columbine-bombs |title=The Bombs: The Columbine Guide |website=The Columbine Guide}}</ref> ====Car bombs==== Both car bombs were made from two 20-pound propane tanks, pipe bombs, and various containers filled with gasoline were spread throughout the vehicles.<ref name="guidebomb"/> Eight pipe bombs were placed in Klebold's car, and one in Harris'.<ref name=bombsum/>
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