He says the soldier will be tried by a military court, starting Wednesday. The official spoke on condition of anonymity because he was not authorised to brief reporters.
The US Army Green Berets were killed November 4 at the Al-Jafr air base in southern Jordan. They came under fire as their convoy entered the base.
Jordanian officials initially said the trainers sparked the shooting by disobeying orders from Jordanian soldiers.
The slain Americans were 27-year-old Staff Sgt. Matthew C. Lewellen, of Kirksville, Missouri; 30-year-old Staff Sgt. Kevin J. McEnroe of Tucson, Arizona; and 27-year-old Staff Sgt. James F. Moriarty of Kerrville, Texas.
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