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.

Details are emerging surrounding the alleged online writings of the gunman at Antioch High School as investigators in Nashville, Tennessee, are looking for a motive.

A female student was killed and another student was injured Wednesday in a shooting in a Nashville high school cafeteria, authorities said, jarring the community nearly two years after another school massacre sparked a debate for gun reform in Tennessee.