Nashville police and schools are monitoring social media discussion and concerns Thursday as people speculate if additional schools could be targeted after a 17-year-old student opened fire Wednesday at Antioch High School, killing himself and a 16-year-old girl while injuring another, officials said.

Analysts with the ADL Center on Extremism "have located a manifesto and social media accounts believed to belong to the shooter, where he shared a range of incel, accelerationist, white supremacist, antisemitic & anti-Black content," the organization wrote in a Wednesday post on X (formerly Twitter ).