A threatening Instagram post on Thursday by Former Dolphins offensive lineman Jonathan Martin caused a high school he attended a decade ago to shut down two of its campuses on Friday.

Martin posted a photo of a rifle lying on a bed, surrounded by ammunition, and had photoshopped hashtags on the photo, including that of his former high school, along with a threatening message.

Martin has reportedly been taken into custody by law enforcement officials.

KTLA5 News reported: The elite private school Harvard-Westlake closed its two campuses in Studio City and Beverly Crest Friday due to a possible security threat posted on social media that may be linked to an ex-National Football League player who graduated from the school a decade ago.

A former student of the preparatory school apparently used Instagram to say he wanted to seek revenge for alleged bullying he underwent when he attended one of the schools, Los Angeles Police Department Officer Tony Kuey said.

Martin reportedly graduated from Harvard-Westlake in 2008, and left the Miami Dolphins in 2013, after being bullied by another Dolphins player. He played for the San Francisco 49ers in 2014, and the Carolina Panthers in 2015, then retired completely from the NFL.

The New York Post further reported:

Martin became the victimized face of NFL bullying in 2013 when he charged teammates, namely fellow offensive lineman Richie Incognito, with harsh treatment in the locker room. On Thursday, he posted an Instagram story that featured a photo of a shotgun and the names of Incognito; another former teammate, Mike Pouncey; and the Los Angeles-area high school, Harvard-Westlake, that Martin attended.

“When you’re a bully victim and a coward, your options are suicide or revenge,” Martin cryptically posted.

The school said in a statement announcing the closure: “Last evening, we learned of an Internet post that mentions Harvard-Westlake by name. Out of an 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. We are working closely with law enforcement and will share more information when we are able.”

A 2013 news broadcast provides details of a bullying incident that led to Martin quitting the Miami Dolphins.

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