Authorities are examining “very concerning online writings and social media posts” connected to the 17-year-old shooter who killed a female student at Antioch High School.

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.

Metro Nashville Police Department authorities have provided updated information on Thursday after a shooting in the Antioch High School cafeteria the day prior.

With this in mind, we asked leaders about protecting against on-campus dangers, and we took a look at the physical security measures in place at some schools in Middle Tennessee.