Sgt. Bowe Bergdahl has told people treating him at a U.S. military medical facility in Germany that he was tortured, beaten and held in a cage by his Taliban captors in Afghanistan after he tried to escape, a senior U.S. official said Sunday.

The official spoke on condition of anonymity because he was not authorized to discuss what Bergdahl has revealed about the conditions of his captivity.

The official said it was difficult to verify the accounts Bergdahl has given since his release a week ago.