On April 20, 1999, while smoking a cigarette at the start of lunch break, Brooks Brown saw Harris arrive at school. Brown had severed his friendship with Harris a year earlier because Harris had thrown a chunk of ice at his car windshield; Brown patched things up with Harris just prior to the shooting. Brown scolded Harris for skipping the morning class, because Harris was always serious about schoolwork and being on time. Harris reportedly said, "It doesn't matter anymore" and also said, "Brooks, I like you now. Get out of here. Go home." Brown quickly left the school grounds. At 11:19 a.m., he heard the first gunshots after he had walked some distance away from the school, and he informed the police via a neighbor's cell phone.
By that time, Dylan Klebold had already arrived at the school in a separate car and the two boys left two gym bags, each containing a 20-pound propane bomb, inside the school cafeteria. When these devices failed to detonate, Harris and Klebold armed themselves with guns and launched a shooting attack against their classmates. It remains the deadliest attack ever perpetrated at an American high school. Harris was responsible for eight of the 13 confirmed deaths, including that of a teacher, while Klebold was responsible for the remaining five. There were 25 wounded, most in critical condition.
Suicide
At 12:02 p.m., Harris and Klebold returned to the library. This was 20 minutes after their lethal shooting spree had ended, leaving 12 students and one teacher dead, and another 24 students injured. Ten of their victims had been killed in the library, with their bodies strewn about the floor. Harris and Klebold went to the west windows and opened fire on the police outside. Six minutes later, they walked to the bookshelves near a table where Patrick Ireland lay badly-wounded and unconscious. Student Lisa Kreutz, injured in the earlier library attack, was also in the room, unable to move.
At 12:08 p.m., art teacher Patti Nielson, who had locked herself inside a break room with student Brian Anderson and library staff, overheard Harris and Klebold shout out in unison: "One! Two! Three!" followed immediately by the sound of gunfire. Harris had fired his shotgun through the roof of his mouth, damaging his face and blasting off the back of his head. Klebold had shot himself in the left temple with his TEC-9 semi-automatic handgun, a bullet slicing through his head.
Acquiring arms
Because Harris and Klebold were both underage at the time, Robyn Anderson (with whom Klebold attended the prom three days before the shooting), an 18-year-old Columbine student and old friend of Klebold's, made a straw purchase of two shotguns and Hi-Point carbine for the pair.
In exchange for her cooperation with the investigation that followed the shootings, no charges were filed against Anderson. After illegally acquiring the weapons, Klebold sawed off his Savage 311-D 12-gauge double-barrel shotgun, shortening the overall length to approximately 23 inches (0.58 m), a felony under the National Firearms Act, while Harris's Savage-Springfield 12-gauge pump shotgun was sawed off to around 26 inches (0.66 m).
The shooters also possessed a 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 Thornton, Colorado, firearms dealer Larry Russell. In violation of federal law, Russell failed to keep records of the sale, yet he determined that the purchaser of the gun was twenty-one years of age or older. He was unable to identify the pictures of Klebold, Anderson, or Harris shown to him by police after the shooting. Two men, Mark Manes and Philip Duran, were convicted of supplying weapons to the two.
The bombs used by the pair varied and were crudely made from carbon dioxide canisters, galvanized pipe, and metal propane bottles. The bombs were primed with matches placed at one end. Both had striker tips on their sleeves. When they rubbed against the bomb, the match head would light 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. Harris purchased more propane tanks on the morning of the attack.
More complex bombs, such as the one that detonated on the corner of South Wadsworth Boulevard and Ken Caryl Avenue, had 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. 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.
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