Oklahoma City police arrested a fired nursing home employee after a coworker alleged that he threatened to cut her head off.

A woman working at the Bellevue Nursing Home in Oklahoma City said that Jacob Muriithi told her that he was Muslim and affiliated with ISIS, which he said “killed Christians by cutting off their heads.”

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The reported incident allegedly happened on Sept. 13 and was reported to police on Sept. 16. Muriithi was arrested Friday.

During questioning, Muriithi reportedly said that he was joking.