United Nations

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Former Bosnian Serb military commander Gen. Ratko Mladic, center, a U.N. security guard, right, and member of his defense, left, are seen at the start of his trial at the Yugoslav war crimes tribunal in The Hague, Netherlands, Wednesday, May 16, 2012. (AP Photo/Toussaint Kluiters, Pool)

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A U.N. observer (center) inspects what residents of the town of Taftanaz, Syria, tell him is a mass grave in this image made from amateur video released by Ugarit News and accessed on Saturday, May 5, 2012. (AP Photo/Ugarit News via AP video)

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Myanmar President Thein Sein (left) shakes hands with U.N. Secretary-General Ban Ki-moon during their meeting at the presidential house in Naypyitaw, Myanmar, on Monday, April 30, 2012. (AP Photo/Khin Maung Win)

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Norwegian Maj. Gen. Robert Mood, head of the U.N. observer team in Syria, is seen next to a portrait of Syrian President Bashar Assad in Damascus, Syria, on Sunday, April 29, 2012. (AP Photo/Bassem Tellawi)

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This image made from amateur video released by Shaam News Network and accessed Friday, April 27, 2012, purports to show the head of the U.N. observer team, Col. Ahmed Himmiche, center, walking in Daraa, Syria. The Associated Press cannot independently verify the content, date, location or authenticity of this material. (AP Photo/Shaam News Network via AP video)

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Syrian protesters gather around U.N. observers during their visit to the restive suburb of Douma, outside Damascus, Syria, on Monday, April 23, 2012. (AP Photo)

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A U.N. observer and a Syrian army officer (left) listen to citizens during a visit to pro-Syrian-regime neighborhoods in Homs province of central Syria on Monday, April 23, 2012. (AP Photo/SANA)

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A United Nations vehicle passes under a Syrian flag held by supporters of President Bashar Assad in Homs on Monday. Syrian troops armed with heavy machine guns killed dozens in the central city of Hama after the U.N. visit. (Sana via Associated Press)