United Nations Headquarters

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President Obama shakes hands with U.N. Secretary General Ban Ki-Moon before addressing the 67th session of the United Nations General Assembly at the United Nations headquarters on Sept. 25, 2012. (Associated Press)

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In this photo provided by Parkwood Entertainment, singer Beyonce performs “I Was Here” in the United Nations General Assembly Hall, Friday, Aug. 10, 2012. Beyonce performed in front of hundreds, including Julia Stiles, R&B singer The-Dream and songwriter Diane Warren, who wrote “I Was Here.” (AP Photo/Parkwood Entertainment, Cliff Watts)

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United Nations-Arab League special envoy to Syria Kofi Anan addresses the United Nations General Assembly on the situation in the Syrian Arab Republic, Thursday, June 7, 2012, at United Nations headquarters. (AP Photo/Mary Altaffer)

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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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Secretary of State Hillary Rodham Clinton addresses a news conference at United Nations headquarters on March 12, 2012. (Associated Press)

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U.S. Secretary of State Hillary Rodham Clinton (center), accompanied by U.S. Ambassador to the United Nations Susan Rice and Russian Foreign Minister Sergei Lavrov, poses for photos at the beginning of their bilateral meeting at United Nations headquarters on March 12, 2012. (Associated Press)

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Palestinian President Mahmoud Abbas (left) addresses the 66th session of the United Nations General Assembly at United Nations headquarters on Sept. 23, 2011. Israeli Prime Minister Benjamin Netanyahu addressed the assembly shortly after Abbas. (Associated Press)

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Palestinian President Mahmoud Abbas (left) poses for a picture with Secretary-General Ban Ki-moon after giving him a letter requesting recognition of Palestine as a state during the 66th session of the General Assembly at United Nations headquarters on Sept. 23, 2011. (Associated Press)

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** FILE ** President Obama addresses the U.N. General Assembly at the United Nations headquarters on Wednesday, Sept. 21, 2011. (AP Photo/Pablo Martinez Monsivais)

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President Obama meets with the National Transitional Council Chairman Mustafa Abdel Jalil at the United Nations building on Sept., 20, 2011. (AP Photo/Pablo Martinez Monsivais)

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A Nigeria policeman stands guard in front of the car-bombed United Nations headquarters in Abuja, Nigeria. The country's president says his government will bring terrorism "under control." The bombing killed 23 people Friday, despite two suspects being arrested beforehand. (Associated Press)

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ASSOCIATED PRESS PHOTOGRAPHS Deputy U.N. Ambassador Ibrahim Dabbashi (right) hugs Libya's U.N. Ambassador Mohamed Shalgham after a meeting of the Security Council at United Nations headquarters in February. Tension was high at the time after fighting broke out between pro- and anti-Gadhafi forces.