Student Killers Acted Alone, Report Says

Colorado detectives have confirmed that the two teenagers who carried out the bloody massacre at Columbine High School in Littleton last year worked alone, a newspaper said. The Denver Post said detectives had checked out at least 4,500 leads, conducted more than 5,000 interviews and examined more than 10,000 pieces of evidence as they probed the April attack that left 15 dead, including the two gunmen, Eric Harris, 18, and Dylan Klebold, 17. After nearly a yearlong investigation, they concluded that the pair were not helped by anyone.