US Secretary of State John Kerry speaks on Syria at the State Department in Washington, DC, on August 26, 2013. The United States said Tuesday that chemical weapons had been used against Syrian civilians and warned President Barack Obama would demand accountability for this "moral obscenity." Employing his strongest language yet, Kerry said Washington was still examining evidence, but left no doubt that Bashar al-Assad's regime would be blamed. AFP Photo/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)