The investigation into why a Nashville high school student fatally shot a classmate before killing himself has centered on his online writings.

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.

The shooter was “significantly influenced by web-based material, especially that found on non-traditional sites that most would find harmful and objectionable,” police said.