PHOENIX -- An Arizona man facing a terrorism charge for brandishing a knife in an encounter with a sheriff's sergeant was carrying out a "lone wolf" attack, authorities said Thursday.
Maricopa County Sheriff Paul Penzone said at a news conference that 18-year-old Ismail Hamed of Fountain Hills told a dispatcher before the Jan. 7 attack that he had an affiliation with a terror group.
Hamed was previously charged with aggravated assault for allegedly throwing rocks at the sergeant and brandishing a knife outside a sheriff's substation in Fountain Hills, a Phoenix suburb.
Investigators said the sergeant shot Hamed after he ignored repeated warnings to drop the weapon.
A terrorism charge accusing Hamed of assisting the Islamic State was filed Tuesday.
A woman at the office of Hamed's attorney, Faisal Ullah, said the law firm had no comment on the case Thursday.