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In this Aug. 28, 2013, citizen journalism image provided by the United Media Office of Arbeen, which has been authenticated based on its contents and other AP reporting, members of the U.N. investigation team take samples from sand near a part of a missile that is likely to be one of the chemical rockets according to activists, in the Damascus countryside of Ain Terma, Syria. (AP Photo/United Media Office of Arbeen)

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