Former NFL player Jonathan Martin was stopped at a Los Angeles area hospital where he went to look for Treatment after his threatening publication on Instagram on Friday led to his previous high school closure for the day, a person familiar with the situation told USA TODAY Sports.

Martin tried to enter the hospital, according to the person who was not authorized to speak in public.

"The individual we believe responsible for the publication of the social networks in question has been arrested and our investigation is ongoing," the Los Angeles Police Department said in a statement to USA TODAY Sports.

A private high School in a suburb of Los Angeles was closed on Friday after threats posted on social media.

Students at Harvard-Westlake High in Studio City received an alert before the school started saying the school was closed. Tony Kway, a Los Angeles police spokesman, told USA TODAY Sports that officers from the department's North Hollywood division responded to the school "after an Instagram post on an ex-student who is now an adult."

Kway said the department could not publicly confirm that Martin's Instagram stories were the ones that caused the shutdown.

"When you are a victim of harassment and a coward, your options are suicide or revenge," Martin wrote in a photo posted on his verified Instagram account. He used the hashtags # HarvardWestlake and #Miami Dolphins.

Martin attended Harvard-Westlake before playing at Stanford and was selected by the Miami Dolphins. In 2013, he accused his teammate of the Dolphins, Richie Incognito, of intimidation, which led to the suspension of Incognito.

Martin tagged Incognito and another former Dolphins teammate (Mike Poucey) on the job. He also labeled James Dunleavy, who attended Harvard-Westlake and was a basketball player at USC.

The Harvard-Westlake closure comes a week after 17 people were killed in a mass shooting at Marjory Stoneman Douglas High in Parkland, Fla.

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