Osmakac, 25, a naturalized U.S. citizen from Pinellas Park and a native of Kosovo, was arrested on Saturday and charged with attempting to use a weapon of mass destruction. He is accused in a federal complaint of plotting to obtain weapons and explosives for a car bomb to carry out attacks in Tampa.

He said he wanted to instill terror in his victims' hearts, calling it "payback" for wrongs done to Muslims, an arrest affidavit said.