(Fox News) U.S. Army Sgt. Bowe Bergdahl at one point during his captivity converted to Islam, fraternized openly with his captors and declared himself a “mujahid,” or warrior for Islam, according to secret documents prepared on the basis of a purported eyewitness account and obtained by Fox News.

The reports indicate that Bergdahl’s relations with his Haqqani captors morphed over time, from periods of hostility, where he was treated very much like a hostage, to periods where, as one source told Fox News, “he became much more of an accepted fellow” than is popularly understood. He even reportedly was allowed to carry a gun at times.

The documents show that Bergdahl at one point escaped his captors for five days and was kept, upon his re-capture, in a metal cage, like an animal. In addition, the reports detail discussions of prisoner swaps and other attempts at a negotiated resolution to the case that appear to have commenced as early as the fall of 2009.

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