Two teens arrested on suspicion of burglary and theft had planned a shooting spree at a rural southwestern Colorado high school as early as this week, according to a sheriff who said he was among the targets. This month marks the 10th anniversary of the Columbine High School massacre near Denver, where two students killed 12 students and a teacher before committing suicide. Sheriff Jim Martin said Thursday that the main force behind the plot, a 16-year-old, also planned to shoot the principal of Dove Creek High School and Martin's undersheriff, then use the law enforcement officers' weapons to continue shooting. Others at the school, including the superintendent, also were targeted, Martin said. Martin said sheriff's deputies recovered seven rifles, including .22-caliber shotguns and an M1 carbine, at the Dove Creek home of the 16-year-old, and three more weapons when the teens were arrested in New Mexico.