Release of 'friendly fire' probe results awaits U.S. approval
The board investigated the death of , who was killed last spring during a firefight between coalition forces and insurgents at Sangin, west of Kandahar.
An inquiry spokesman said Canadians can rest assured the investigation will determine what happened, but some classified information will be withheld.
The possibility that Costall, a 22-year-old machine gunner, was killed by friendly fire was raised by his wounded comrades when the brigade commander, Canadian Brig.-Gen. David Fraser, visited them in hospital.
The troops told Fraser they had been hit by fire from their own side as they rushed to take up positions.