The teenager who fatally shot a student at a high school in Nashville, Tennessee, livestreamed part of the incident, according to the platform he used, and he was influenced by internet content that authorities described Thursday as “harmful and objectionable.

Students and parents described a scene of chaos, confusion, and terror during the deadly shooting at Antioch High School on Wednesday.

A 16-year-old female student was killed, another student was wounded, and the shooter—a 17-year-old male student—killed himself, per police.