CENTENNIAL, Colo. (AP) — A sheriff says a teenager who opened fire Friday at a suburban Denver school, wounding a fellow student before killing himself, entered the school with a shotgun, machete and three incendiary devices in his backpack and had ammunition strapped to body.
Arapahoe County Sheriff Grayson Robinson says 18-year-old Karl Pierson bought the gun legally at a local store Dec. 6.
Anyone over the age of 18 is allowed to buy a shotgun in Colorado. Only those over 21 can legally buy a handgun.
Robinson says the shooting likely was motived by retaliation against a faculty member, probably a librarian.
He identified the wounded student as 17-year-old Claire Esther Davis.