The active-duty soldier, identified as Ikaika Kang, 34, of Waipahu, also apparently swore allegiance to ISIS, the statement said. He was taken into custody Saturday by an FBI SWAT team.

Kang was assigned to Schofield Barracks in Honolulu.

Paul D. Delacourt, the FBI’s special agent in charge in Honolulu, said in the statement that the Army and the FBI had been investigating Kang for more than a year.