Officials said to be frustrated by prospects of getting the Afghan leader to sign a long-term pact.
Comes after the first results in December sparked cries of Washington meddling in local affairs.
Afghan leader attacks U.S. for air strike that left a woman and seven children dead.
Video of Sgt. Bowe Bergdahl commenting on recent events has the U.S. military thinking he's still alive.
Bagram release comes amid wrangling over bilateral security deal.
Karzai's decision not to sign security pact has created huge political difficulties.
Rejects recommendation from Loya Jirga to quickly ink security pact.
Opponents of U.S. drone strikes rough up drivers after party led by cricket star Imran Khan gets involved.
Afghanistan faces a possible repeat of abuses that have discredited efforts to build a democracy.
Afghan President suggests negotiations with the United States have concluded, with a presentation to tribal elders on deck.
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