South Sudanese fleeing an attack on the town of Rank, on Saturday. The United Nations says when rebels seized the town of Bentiu, south of Rank, earlier this month, hundreds became victims of ethnically targeted killings. Mohamed Nureldin Abdallah/Reuters/Landov hide caption

itoggle caption Mohamed Nureldin Abdallah/Reuters/Landov

Hostages being held at the U.S. Embassy in Tehran in November 1979. Iran's choice for U.N. ambassador, Hamid Aboutalebi, has acknowledged that he was an interpreter for the student group that seized the compound. AP hide caption

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Russia has vetoed a U.N. Security Council resolution that would invalidate Sunday's referendum in Crimea. In Moscow, demonstrators and military veterans march in support of the Kremlin Saturday; nearby, a large march was held to protest Russia's policies. Alexander Zemlianichenko/AP hide caption

itoggle caption Alexander Zemlianichenko/AP

Haitians protest against United Nations peacekeepers in Port-au-Prince in 2010. Hector Retamal/AFP/Getty Images hide caption

itoggle caption Hector Retamal/AFP/Getty Images

Iranian President Hasan Rouhani speaks at the United Nations on Tuesday. The U.S. and Iran are taking part in talks Thursday, looking for a possible breakthrough after years of negotiations on Iran's nuclear program. Stan Honda/AFP/Getty Images hide caption

itoggle caption Stan Honda/AFP/Getty Images

President Obama addresses the 68th session of the United Nations General Assembly at the United Nations in New York. Timothy Clary/AFP/Getty Images hide caption

itoggle caption Timothy Clary/AFP/Getty Images

A doctor takes an HIV test from an athlete during the 18th National Sports Festival in Lagos, Nigeria, last December. Sunday Alamba/AP hide caption

itoggle caption Sunday Alamba/AP

Near Islamabad, Pakistan, 6-year-old Jabro Mounir was arranging bricks this summer — part of his daily work at a brick-making facility. He earns a little less than $2 per day. Muhammed Muheisen/AP hide caption

itoggle caption Muhammed Muheisen/AP

Sudan's President Omar al-Bashir, who faces genocide charges, has applied for a visa to come to the U.S. for the annual United Nations General Assembly next week. The U.S. has not yet said whether he'll be allowed in the country. Mohamed Nureldin Abdallah/Reuters/Landov hide caption

itoggle caption Mohamed Nureldin Abdallah/Reuters/Landov