The father of a U.S. soldier arrested on terrorism charges says his son may have post-traumatic stress disorder.
Authorities say Sgt. 1st Class Ikaika Kang, 34 pledged allegiance to the Islamic State group and said he wanted to "kill a bunch of people."
Clifford Kang tells KHON-TV that he became concerned after his son's return from Afghanistan and Iraq. He says he told his son "maybe he had PTSD."
Kang says his son had a Quran and had even given him one.
The FBI arrested Kang, in Hawaii over the weekend after a yearlong investigation. He made an initial appearance Monday in federal court.
Kang's court-appointed defense attorney, Birney Bervar, said it appears his client may suffer from service-related mental health issues of which the government was aware but neglected to treat.