Harvard-Westlake School in Studio City, California, along with Mr. The picture posted to his Instagram story shows a shotgun and several rounds of ammunition, along with the caption "When you're a bully victim & a coward your options are suicide, or revenge".
The decision to close the campus Friday was made by school officials, not police, Kuey said.
The KTLA report didn't list Martin as being responsible for the threat, but did mention that a former student was behind the implied threat.
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The Instagram account has no profile photo, but is a verified account with 347 followers.
A 144-page report commissioned by the National Football League to explore allegations of bullying on the Dolphins found that Incognito and two fellow offensive linemen, John Jerry and Mike Pouncey, "engaged in a pattern of harassment" toward Martin; another young offensive lineman; and an assistant trainer, including improper touching and sexual taunting. "With these precautions in place, we believe there is no imminent threat to our campuses or our school community", Commons said.
"Very late last night, we were made aware of a disturbing social media post that mentioned Harvard-Westlake by name", read a message from the school's president, Richard B. Commons. "We are working closely with law enforcement and will share more information when we are able", the school said in a statement. James Dunleavy was Martin's teammate at at Harvard Westlake, and Richie Incognito and Mike Pouncey played on the Miami Dolphins with Martin.
At this time, it's unclear if Martin is receiving medical treatment. The Carolina Panthers claimed Martin off waivers in March, but Martin retired before training camp opened in 2015, citing a back injury. Former Miami Dolphins player Jonathan Martin was questioned by Los Angeles police after a threatening Instagram post that spoke of bullying.