A teenager who opened fire with a 9 mm pistol in his Nashville high school cafeteria fired a total of 10 shots within 17 seconds of entering the room, according to police. Henderson shot and killed 16-year-old Josselin Corea Escalante and shot and wounded a 17-year-old boy at Antioch High School around 11 a.

A district official said the system failed to detect the shooter's handgun because of where cameras were in the school.