Editing Eric Harris and Dylan Klebold (section)

==Acquiring arms==
Harris and Klebold were unable to legally purchase firearms due to their both being underage at the time. Klebold then enlisted Robyn Anderson, an 18-year-old Columbine student and old friend of Klebold's, to make a [[straw purchase]] of two shotguns and a [[Hi-Point carbine]] for the pair. In exchange for her cooperation with the investigation that followed the shootings, no charges were filed against Anderson.<ref>{{cite web |url=https://extras.denverpost.com/news/shot0605.htm |title=Gunman's prom date airs story |access-date=July 13, 2020 |archive-date=June 10, 2019 |archive-url=https://web.archive.org/web/20190610173923/http://extras.denverpost.com/news/shot0605.htm |url-status=live }}</ref> After illegally acquiring the weapons, Klebold [[Sawed-off shotgun|sawed off]] his Savage 311-D 12-gauge [[double-barrel shotgun]], shortening the overall length to approximately {{convert|23|in|mm}}. Meanwhile, Harris's Savage-Springfield 12-gauge pump shotgun was sawn off to around {{convert|26|in|mm}}.<ref>{{cite news |title=How they were equipped that day |url=http://www.cnn.com/SPECIALS/2000/columbine.cd/Pages/EQUIPMENT_TEXT.htm |work=[[CNN]] |access-date=November 25, 2009 |archive-url=https://web.archive.org/web/20091202153237/http://www.cnn.com/SPECIALS/2000/columbine.cd/Pages/EQUIPMENT_TEXT.htm |archive-date=December 2, 2009 |url-status=live }}</ref>

The shooters also possessed a [[Intratec TEC-DC9|TEC-DC9]] semi-automatic handgun, which had a long history. The manufacturer of the TEC-DC9 first sold it to Miami-based Navegar Incorporated. It was then sold to Zander's Sporting Goods in [[Baldwin, Illinois]], in 1994. The gun was later sold to a firearms dealer, Larry Russell, in [[Thornton, Colorado]]. In violation of federal law, Russell failed to keep [[Federal Form 4473|records]] of the sale, yet he determined that the purchaser of the gun was twenty-one years of age or older. Two men, Mark Manes and Philip Duran, were convicted of supplying weapons to the two.<ref>{{cite news |url=http://extras.denverpost.com/news/shot1113.htm |title=Judge gives Manes 6 years |newspaper=The Denver Post |last1=Pankratz |first1=Howard |last2=Simpson |first2=Kevin |date=November 13, 1999 |access-date=December 11, 2013 |archive-url=https://web.archive.org/web/20141020154824/http://extras.denverpost.com/news/shot1113.htm |archive-date=October 20, 2014 |url-status=live }}</ref>

The bombs used by the pair varied and were crudely made from [[carbon dioxide]] canisters, galvanized pipe, and metal [[propane]] tanks. The CO<sub>2</sub> and pipe bombs were primed with matches placed at one end end their fuses. Both had striker tips on their sleeves. When they rubbed against the bomb, the match head lit the fuse. The weekend before the shootings, Harris and Klebold had purchased propane tanks and other supplies from a hardware store for a few hundred dollars. Several residents of the area claimed to have heard glass breaking and buzzing sounds from the Harris family's garage, which later was concluded to indicate they were constructing pipe bombs.<ref>{{cite web|url=https://www.columbine-guide.com/columbine-bombs|title=The Bombs: The Columbine Guide-Eric Harris & Dylan Klebold Sue|website=columbine-guide|access-date=July 4, 2020|archive-date=September 23, 2020|archive-url=https://web.archive.org/web/20200923212941/https://www.columbine-guide.com/columbine-bombs|url-status=live}}</ref>

More complex bombs, such as the one that detonated on the corner of South Wadsworth Boulevard and Ken Caryl Avenue, had [[time bomb|timers]]. The two largest bombs built were found in the school cafeteria and were made from small propane tanks. Only one of these bombs went off, only partially detonating.<ref name="Suspects" /> It was estimated that if any of the bombs placed in the cafeteria had detonated properly, the blast could have caused extensive structural damage to the school and would have resulted in hundreds of casualties.<ref>{{cite web |title=At 'perfect' school, student sat next to bomb |url=http://www.rockymountainnews.com/drmn/local/article/0,1299,DRMN_15_1076860,00.html |date=April 12, 2002 |work=Rocky Mountain News |first=Lynn |last=Bartels |access-date=August 24, 2008 |archive-url=https://web.archive.org/web/20080420145325/http://www.rockymountainnews.com/drmn/local/article/0%2C1299%2CDRMN_15_1076860%2C00.html |archive-date=April 20, 2008 |url-status=dead }}</ref>