In this citizen journalism image provided by the United media office of Arbeen that has been authenticated based on its contents and other AP reporting, U.N. investigation team with blue helmets, walk with Syrian rebels in Damascus countryside of Zamalka, Syria, on Aug. 28, 2013. U.N. chemical weapons experts headed to a Damascus suburb on Wednesday for a new tour of areas struck by a purported poison gas attack, activists said, as Western powers laid the groundwork for a possible punitive strike and the U.N. chief pleaded for more time for diplomacy. (Associated Press/United media office of Arbeen)
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