On 20 April 1999, in one of the deadliest school shootings in national history, two students at Columbine High School in Littleton, Jefferson County, Colorado, killed twelve fellow students and a teacher and injured twenty-three others before committing suicide. Eric Harris, age eighteen, and Dylan Klebold, age seventeen, used homemade bombs, two sawed-off twelve-gauge shotguns, a nine-millimeter semiautomatic rifle, and a nine-millimeter semiautomatic pistol in a siege that began shortly after 11 A.M.
From Dictionary of American History, 3E. © 2003 Gale, a part of Cengage Learning, Inc. Reproduced by permission. www.cengage.com/permissions
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Yellin, Eric. "Columbine School Massacre." Dictionary of American History. Ed. Stanley I. Kutler. 3rd ed. Vol. 2. New York: Gale, 2003. 305. Print.