Updated

A 16-year-old gunman opened fire at an Oregon primary school, killing three children and a teacher before being shot dead by a local community member who followed him into the building. Police have not yet detailed a motive. The shooting adds to the string of school attacks across the US that continue to fuel debate over school security and gun access. Authorities are still investigating how the teenager obtained his weapon and entered the school. The incident has prompted renewed calls from parents and officials for stronger protective measures at schools nationwide.