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 female student was killed and another student was injured Wednesday in a shooting in a Nashville high school cafeteria, authorities said, jarring the community nearly two years after another school massacre sparked a debate for gun reform in Tennessee.