10 Years After: Remembering Columbine

Eric Harris and Dylan Klebold, seniors at Columbine, the suburban Denver school, detonated homemade bombs and opened fire with shotguns, a rifle and a semiautomatic handgun on April 20, 1999. They killed 12 students, injured 23 others and mortally wounded a teacher before committing suicide.

Photo: Courtesy of MSNBC
Caption: An unidentified woman looks at 15 crosses on a hill above the school in Littleton, Colo. -- one cross for each of the people who died during the shooting rampage, including the two gunmen.