"We are working closely with law enforcement and will share more information when we are available". Police suspect Martin is behind the supposed threats and are now investigating. Former teammates Richie Incognito and Mike Pouncey, as well as two others, were tagged in the post.
The police are investigating, but have reason to believe it was in fact Martin who created the post. Martin attended Harvard-Westlake before going to college at Stanford.
A photograph he posted on Instagram showed a rifle and included a message that said bullying victims had only two choices, suicide and revenge.
The threat was taken as a serious threat by his former high-school which went on lock-down shortly after the post was made on Instagram.
"According to Martin, in middle school and high school he was the victim of bullying, which diminished his self-confidence and self-esteem and contributed to what he self-diagnosed as periodic bouts of depression during his teenage years", the report said.
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"You learn to tone down your size & blackness by becoming shy, introverted, friendly, so you won't scare the little rich white kids or their parents", Martin wrote, according to the New York Times.
Friday's evacuation of the private school follows last week's shooting at a Parkland, Fla., high school that killed 17 people when a former student allegedly attacked the school with an AR-15.
The Carolina Panthers claimed Martin, the Dolphins' 2012 second-round pick, off waivers in March, but Martin retired before training camp opened in 2015, citing a back injury.
In the report, the league found that Incognito and Pouncey "engaged in a pattern of harassment directed" at Martin.