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A member of the Islamist Syrian opposition group Ahrar al-Sham fires against a position of the Committees for the Protection of the Kurdish People (YPG), a militia set up to protect Kurdish areas in Syria from opposing forces, during clashes in the countryside of the northern Syrian Raqqa province on August 25, 2013. Syrian Foreign Minister Walid Muallem said on August 27 the UN mission investigating alleged chemical weapons attacks in Damascus has been delayed until the following after rebels failed to guarantee the experts' safety. AFP PHOTO/ALICE MARTINSALICE Martins/AFP/Getty Images
A member of the Islamist Syrian opposition group Ahrar al-Sham fires against a position of the Committees for the Protection of the Kurdish People (YPG), a militia set up to protect Kurdish areas in Syria from opposing forces, during clashes in the countryside of the northern Syrian Raqqa province on August 25, 2013. Syrian Foreign Minister Walid Muallem said on August 27 the UN mission investigating alleged chemical weapons attacks in Damascus has been delayed until the following after rebels failed to guarantee the experts' safety. AFP PHOTO/ALICE MARTINSALICE Martins/AFP/Getty Images

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Col. Kemp: Attack could go on for days

CNN's Hala Gorani speaks with Col. Richard Kemp about what options are on the table for the U.S. and its allies.

Col. Kemp: Attack could go on for days

CNN's Hala Gorani speaks with Col. Richard Kemp about what options are on the table for the U.S. and its allies.