Federal authorities are reportedly investigating threats made by Islamic sympathizers against former Special Forces solider and current UFC fighter Tim Kennedy.

The Army Times reported Wednesday that followers of ISIS have made “recent credible threats” against Kennedy. But that doesn’t mean Kennedy is shying away from the fight.

“Just spoke to the FBI regarding some recent credible threats towards me by #ISIS,” Kennedy wrote in a Facebook post Wednesday. “They were not overly thrilled with my response…’Let those cowards come.’”