Authorities in Florida have arrested a 26-year-old white man for a threatening Facebook post warning of a mass shooting with his AR-15 rifle.

“Florida authorities are charging a 26-year-old Winter Park man they say posted a threat on Facebook that he was about to have his semi-automatic rifle returned and people should stay away from Walmart,” The Florida Department of Law Enforcement arrested Richard D. Clayton on Friday north of Orlando.”

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“Richard D. Clayton, 26, of Winter Park was arrested Friday after he posted threats to kill or do bodily harm on Facebook,” Click Orlando reported Saturday. “The arrest came after a joint investigation by FDLE, FBI’s Joint Terrorism Task Force and Winter Park Police Department.”

Clayton allegedly posted, “3 more days of probation left then I get my AR-15 back. Don’t go to Walmart next week.”

He was arrested by the Florida Department of Law Enforcement (FDLE).

“Investigators say Clayton appears to believe in the white supremacist ideology and has a history of posting threats on Facebook using fictitious accounts,” authorities said in a news release.

Clayton is being in held the Orange County Jail on $15,000 bond.