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Chemical weapons use hampers Syrian deal: Kerry

US Secretary of State John Kerry speaks at the State Department on June 12, 2013 in Washington, DC. Kerry warned for the first time Saturday that chances for a political settlement in Syria could be undermined by the Assad regime's use of chemical weaponsUS Secretary of State John Kerry warned for the first time Saturday that chances for a political settlement in Syria could be undermined by the Assad regime's use of chemical weapons.