FILE - In this Thursday, Aug. 29, 2013 file citizen journalism image provided by the Local Committee of Arbeen which has been authenticated based on its contents and other AP reporting, members of the UN investigation team take samples from the ground in the Damascus countryside of Zamalka, Syria. Syrian opposition activists and other witnesses tell The Associated Press that Syrian government forces have attacked rebel-held areas with poisonous chlorine gas in recent months. They say the attacks left scores of men, women and children coughing, choking and gasping for breath. The reports have been denied by the Syrian government and have yet to be confirmed by any foreign country or international organization. But if true, they highlight the limitations of the global effort to rid Syria of its chemical weapons. (AP Photo/Local Committee of Arbeen, File)
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