United Nations

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This image made from amateur video purports to show a Free Syrian Army solider accompanying U.N. observers in Rastan town in Homs, Syria. (Associated Press)

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This image made from video and supplied by Syrian TV shows U.N. observers during a visit to Homs, Syria, on Saturday, April 21, 2012. (AP Photo/Syria TV via AP Video)

This image made from video made available by Syrian TV shows U.N. observer team leader Col. Ahmed Himmiche, left, meeting with the governor of Homs, Syria, Saturday, April 21, 2012. (AP Photo/Syria TV via AP video) TV OUT SYRIA OUT

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Syrian Ambassador to the United Nations Bashar Ja'afari addresses the United Nations Security Council, Saturday, April 14, 2012, at U.N. headquarters after the council cast a unanimous vote authorizing the deployment of the first wave of U.N. military observers to monitor a cease-fire between the Syrian government and opposition fighters. (AP Photo/Craig Ruttle)

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Sergey Ryabkov, Deputy Foreign Minister of the Russian Federation, at United Nations headquarters, Tuesday, May 4, 2010. (AP Photo/Richard Drew)

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U.N. observers, led by Moroccan Col. Ahmed Himmiche (left), leave the Sheraton Hotel in Damascus, Syria, on Monday, April 16, 2012. (AP Photo/Bassem Tellawi)

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"We will start our mission as soon as possible and we hope it will be a success," says Col. Ahmed Himmiche (foreground) of Morocco before he and other U.N. observers leave a hotel in Damascus, Syria, on Monday. (Associated Press)

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U.N. observers, led by Moroccan Col. Ahmed Himmiche (left), leave the Sheraton Hotel in Damascus, Syria, on April 16, 2012. (Associated Press)

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U.S. Ambassador to the United Nations Susan Rice addresses members of the media at U.N. headquarters Saturday, April 14, 2012 after the United Nations Security Council cast a unanimous vote authorizing the deployment of the first wave of U.N. military observers to monitor a cease-fire between the Syrian government and opposition fighters. (AP Photo/Craig Ruttle)

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In this photo provided by the United Nations, United Nations Secretary-General Ban Ki-moon speaks via telephone to with U.N.-Arab League envoy Kofi Annan from his hotel room in Geneva, Switzerland, on Thursday, April 12, 2012, the deadline for the cease-fire in Syria. (AP Photo/The United Nations, Evan Schneider)

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China's Ambassador Li Baodong, third from right, arrives for consultations at the United Nations on Friday, April 13, 2012. The United Nations Security Council is planning an emergency meeting to discuss Thursday's failed rocket launch by North Korea. (AP Photo/Bebeto Matthews)

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United Nations Secretary-General Ban Ki-moon speaks about the situation in Syria during a news conference Thursday at the European headquarters of the United Nations in Geneva. (Associated Press)

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U.N.-Arab League envoy Kofi Annan, third from left, is welcomed by Syrian refugee children upon his arrival at Yayladagi refugee camp in Hatay province, Turkey, Tuesday, April 10, 2012. (AP Photo/Umit Bektas, Pool)

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**FILE** Malawian President Bingu wa Mutharika arrives Feb. 1, 2010, at the U.N. Conference Hall in Addis Ababa, Ethiopia. (Associated Press)

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Former U.N. Secretary-General Kofi Annan (left), the U.N.-Arab League special envoy to Syria, poses with Maj. Gen. Robert Mood of Norway before a meeting at the European headquarters of the United Nations in Geneva on Wednesday, April 4, 2012. Gen. Mood is heading a planning team for a possible deployment of a U.N. supervision and monitoring mission in Syria. (AP Photo/Keystone/Martial Trezzini)