School shooting in Bend, Oregon kills three children and teacher; teen suspect dead

A 16-year-old male shot and killed three children (ages 5, 8, 11) and a teacher at an elementary school in Bend, Oregon, injuring a 7-year-old and another teacher. The suspect was fatally shot by a civilian before police arrived. This is a mass-casualty incident in a U.S. school, a recurring pattern, but the civilian intervention is notable.