On April 20, 1999, in the small, suburban town of Littleton, Colorado, two high-school seniors, Dylan Klebold and Eric Harris, enacted an all-out assault on Columbine High School during the middle of the school day. The boys' plan was to kill hundreds of their peers. With guns, knives, and a multitude of bombs, the two boys walked the hallways and killed. When the day was done, twelve students, one teacher, and the two murderers were dead; plus 21 more were injured.