Worries remain, however, that Iran, India or other countries would back off agreement.
Alabama native who waged jihad alongside al-Shabab militants faces a Saturday deadline to surrender to the insurgents or be killed.
U.S. intelligence officials fear the terrorists could be on the verge of establishing an Iraq-like foothold that would be hard to defeat if rebels eventually oust President Bashar Assad.
Is the long-running U.S. drone programme legal - and are Americans legitimate targets?
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