United Nations

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Members of a U.N. investigation team take samples from sand near a part of a missile that is likely to be a chemical-weapons rocket, according to activists, in the Damascus countryside of Ain Terma, Syria, on Wednesday, Aug. 28, 2013. (AP Photo/United Media Office of Arbeen) ** FILE **

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**FILE** U.S. United Nations Ambassador Samantha Power speaks about Syria on Sept. 6, 2013, at the Center for American Progress in Washington. (Associated Press)

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U.N. experts arrive at the entrance of the private jet terminal at Beirut international airport, Lebanon, for the departure, after their convoy of U.N. experts left Syria into Lebanon Saturday, Aug. 31, 2013. (Associated Press)

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** FILE ** In this citizen journalism image provided by the United media office of Arbeen which 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, Wednesday, Aug. 28, 2013. (AP Photo/United media office of Arbeen)

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U.S. Ambassador Samantha Power talks with British delegate Michael Tatham in the United Nations Security Council, Thursday, Aug. 29, 2013. U.N. Secretary-General Ban Ki-moon said the Inspection team in Syria is expected to complete its work Friday and report to him Saturday. (AP Photo/Richard Drew)

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** FILE ** In this Wednesday, Aug. 28, 2013, file citizen journalism image provided by the United media office of Arbeen which has been authenticated based on its contents and other AP reporting, a member of a U.N. investigation team takes samples of sands near a part of a missile 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, File)

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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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Andrew Young, who was U.S. ambassador to the United Nations during the Carter administration, speaks during the "I Have a Dream" gospel brunch at the Willard InterContinental hotel in Washington on Sunday, Aug. 25, 2013. (AP Photo/Jose Luis Magana)

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U.N. Secretary General Ban Ki-moon, right, bows to the guests prior to delivering a speech marking the 100th anniversary of the U.N. Peace Palace in The Hague, Netherlands, Wednesday Aug. 28, 2013. (AP Photo/Peter Dejong)

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In this image taken from amateur video posted online, a presumed U.N. staff member measuring and photographing a canister in the suburb of Moadamiyeh in Damascus, Syria on Monday. the suburb is where the Syrian regime allegedly used chemical weapons. (Associated Press)