3 die in St. Louis school shooting

An armed former student broke into a St. Louis high school in Missouri State Monday morning warning, "You are all going to die!" before fatally shooting a teacher and a teenage girl, and wounding six others before police killed him in an exchange of gunfire.

The attack just after 9 a.m. at Central Visual and Performing Arts High School forced students to barricade doors and huddle in classroom corners, jump from windows and run out of the building to seek safety.

Police Chief Michael Sack said fast actions by a security guard, along with police officers who "ran to the gunfire" helped end the shooting before more people were killed or hurt. Police on Monday evening identified the shooter as 19-year-old Orlando Harris, who graduated from the school last year. Harris had no prior criminal history.