Former NFL offensive lineman Jonathan Martin has received four charges of making criminal threats and one count of possessing a loaded firearm from the Los Angeles County district attorney, according to TMZ. The charges stem from a photo of a shotgun and multiple shells posted on his Instagram account in late February.

The image included the names of Mike Pouncey and Richie Incognito, two former teammates. The photo is accompanied by the disturbing caption, “When you’re a bully victim & coward, your options are suicide, or revenge.”

Harvard-Westlake School was also shut down amid concerns that Martin, an alumnus of the school, was threatening to shoot it up. "Out of abundance of caution, and because the safety of our students, faculty, and staff is our top priority, we made the decision to close school today,” the school said in a statement. “We are working closely with law enforcement and will share more information when we are able." 

When Martin was arrested, police recovered a cache of weapons in his possession, including an ax, knife, and loaded shotgun. Authorities discovered that the former NFL player had been sending threatening Facebook messages to two ex-classmates since 2016. 

A warrant has been issued for Martin's arrest.