The US military has begun an investigation into the 2009 disappearance in Afghanistan of Bowe Bergdahl, the soldier freed last month after five years in Taliban captivity.
"The Army has initiated its investigation into the facts and circumstances surrounding the disappearance and capture of Sergeant Bowe Bergdahl from Combat Outpost Mest-Lalak in Paktika Province, Afghanistan on or about June 30, 2009," the army said in a statement.
Major General Kenneth Dahl will head the investigation, it said.
Bergdahl, who is being treated at a Texas medical base after returning to the US last week, will not be interviewed until a military team that specialises in returning prisoners of war clears him to do so.
"No timeline for completion of the investigation has been set," the army said.
Reuters reported over the weekend that a two-star general had been appointed to head the probe.