The NATO Resolute Support Combined Civilian Casualty Assessment Team (CCAT) in Afghanistan says that it is continuing its inquiry into the Oct. 3 incident involving the bombing of a Doctors Without Borders hospital in northern Kunduz province.

A NATO statement released on Saturday said that to ensure the U.S. military's own investigation is conducted in an independent and unbiased manner, the commander of Resolute Support in Afghanistan, Gen. John Campbell, has appointed U.S. Army Maj. Gen. William Hickman and two Brigadier Generals — all from outside the chain of command — to conduct the investigation.

They will continue the work on the investigation begun by Brig. Gen. Richard Kim, the statement added.

U.S. forces have acknowledged that they mistakenly bombed the hospital; the death toll stands at 23 people killed.