A 15-year-old student killed a teacher and another teenager with a handgun Monday at a Christian school in Wisconsin, terrifying classmates including a second grader who made the 911 call that sent dozens of police officers rushing to the small school just a week before its Christmas break.

MADISON, Wisconsin — A teenager shot and killed a fellow student and a teacher and wounded six other people at a small private Christian school on Monday, leaving a community reeling as another act of violence struck America.