The U.S. soldier accused of killing 16 civilians during a weekend rampage has been transferred out of Afghanistan while awaiting charges, the NATO command said late Wednesday.

The still-unidentified Army staff sergeant was transferred on the recommendation of advisers to Gen. John Allen, the commander of U.S. and allied forces in Afghanistan, and because "we do not have the proper facility in Afghanistan to detain him for longer than he is being held," said Capt. John Kirby, a Pentagon spokesman.

The soldier's destination was not immediately disclosed.