Law enforcement officials seeking a motive for a shooting at Nashville’s Antioch High School on Wednesday morning are examining alarming social media posts and writings tied to a teenager police say shot and killed a 16-year-old girl.

Two students are dead and one injured after a 17 year-old boy opened fire at Antioch High School Wednesday morning.

A female student was killed and another student was wounded Wednesday in shooting in a Nashville high school cafeteria, police said. The 17-year-old shooter, who was also a student at Antioch High School, later shot and killed himself with a handgun, Metro Nashville Police spokesperson Don Aaron said during a news conference.