Bowe Bergdahl after his release from captivity
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FBI probes death threats against Bowe Bergdahl's father

US authorities are investigating death threats apparently emailed to the father of Bowe Bergdahl, the soldier released by the Afghan Taliban last week after five years in captivity.

Meanwhile the New York Times has reported that he was tortured, beaten and held in a cage after trying to escape, as the BBC's David Willis reports.

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