SALEM, Ore. (AP) – One of two 17-year-old boys shot in the back at an Oregon elementary school has died. The shooting Wednesday in a parking lot at Four Corners Elementary School in Salem left one youth critically injured and the other with non-life-threatening injuries. The Marion County Sheriff’s Office says the more seriously wounded teenager died Saturday. A teenager found after the shooting has been charged with first-degree robbery, unlawful possession of a firearm, unlawful use of a weapon and first-degree theft. None of the youths has been publicly identified. The shooting remains under investigation.