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Prime minister's defection boosts Syrian rebels
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U.S.: Al Qaeda, other extremists aiding Syrian rebels
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Prime minister's defection boosts Syrian rebels
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Syria's Assad showing signs of desperation
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Panetta: Rebel Fighting in Aleppo 'nail in Assad's coffin'
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Defections signal Syrian regime losing its grip, analysts say
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Pentagon prepares for collapse of Syrian regime
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Al Qaeda makes inroads in Syria, officials say
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Syrian opposition worries Assad will unleash chemical weapons
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Defections could spell end for Assad
