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An aerial view shows the immense crowd at the memorial on Sunday, April 25, 1999, in Littleton, Colo., for those slain at the Columbine High School shootings on Tuesday. Thirteen white doves fluttered into the slate gray sky Sunday, over the heads of 70,000 people who filled a parking lot to mourn the 12 students and one teacher massacred at Columbine High School. Families, friends and strangers clung to each other during a 75-minute memorial service. They clutched flowers, blue and silver balloons andBibles as they wept and wondered why it happened. (AP Photo/Denver Rocky Mountain News, Rodolfo Gonzalez) MANDATORY CREDIT; ONLINE OUT; MAGS OUT; TV OUT; CODEN OUT