A 16-year-old Bend, Oregon resident shot through locked doors at an Oregon elementary school, and then shot and killed three children, ages 5, 8, and 11 along with a teacher. Remarkably, an armed community member saw the teen enter Silver Rail Elementary School with a long rifle and pursued him inside the school and shot him dead before police arrived. Another teacher and a 7-year-old student were critically injured and are currently in the hospital. Police say the heroic bystander saved countless lives, and credit him, along with a new classroom door lock system from keeping dozens of children and teachers safe.