Orlando terrorist Omar Mateen once threatened to massacre his classmates at a barbecue in the spring of 2007 after a piece of pork touched his hamburger. The barbecue was put on by an academy designed to instruct future hopeful corrections officers, The Wall Street Journal reports.

Immediately after the pork touched the burger, he reportedly threatened to kill everybody at the event. Although his classmates tried to laugh off his unhinged remarks, Mateen followed up by insisting that he was not joking and that he was definitely “going to come back and shoot” them.

Soon after, Mateen again threatened to carry out a shooting at a policy academy. The reason? He felt he was being mistreated as a Muslim.

Throughout his life, Mateen repeatedly flew into rages and threatened to kill people for reasons connected to his Islamic beliefs — biographical information that challenges claims that his Muslim background played no part in his massacre at the Pulse nightclub Sunday, which left 50 dead, himself included, and injured 53.

Seddique Mateen, Omar’s father, insisted that his son’s actions had nothing to do with religion whatsoever, but added that Omar had been enraged two months before after seeing two men kiss.

Additionally, Omar bragged about having terrorist connections and pledged allegiance to numerous terror organizations like Hezbollah and, at the scene of the shooting, the Islamic State. He also posted comments on Facebook such as “The real Muslims will never accept the filthy ways of the West.” In another instance, he said he wanted to get raided by the feds and mistreated just so he could claim the title of “martyr.”

Despite all the warning signs, the FBI was not conducting surveillance on Mateen when he shot up the Pulse nightclub, even though agents had previously interviewed him numerous times.

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