A student opened fire inside Antioch High School, shooting two other students and then himself, the authorities said. A female student and the shooter were killed, officials said.

One of the 12-year-olds threatened to shoot four of his classmates, the other posted a threat on Instagram and an 11th grader threatened “Antioch part two,” according to police.

Two people were shot before the shooter turned the gun on themselves at Antioch High School in Nashville, Wednesday, according to officials.