A 17-year-old boy who opened fire in his Nashville high school's cafeteria fired a total of 10 shots from a 9 mm pistol within 17 seconds of entering the room.

Police say the gun used in the Nashville school shooting was purchased in Arizona as detectives piece together why the high school student fatally shot a classmate before killing himself

A teenager opened fire at Antioch High School Wednesday killing a student and leaving a mourning community that has already seen two mass shooting incidents in recent years.