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.

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.

Get all the news you need in your inbox each morning. On Wednesday, Metro Nashville Police Department spokesman Don Aaron said police received the first call to 911 at 11:11 a.m., two minutes after the 17-year-old student opened fire at the high school.