Secretary-general of the League of Arab States Nabil Elaraby (left) and Egyptian Foreign Minister Sameh Shukri attend a news conference after the closing session of the Arab League Summit in Sharm el-Sheikh, Egypt, on Sunday. The 22-nation body agreed in principle to establishing a regional security force. Cui Xinyu/Xinhua/Landov hide caption

itoggle caption Cui Xinyu/Xinhua/Landov

Nigerian electoral officials collate results at a polling station in the oil rich Niger Delta, Port Harcourt, Nigeria on Sunday. Millions of voters headed to the polls in the Nigerian general elections after being delayed for over a month. Tife Owolabi/EPA/Landov hide caption

itoggle caption Tife Owolabi/EPA/Landov

Afghanistan's Chief Executive Officer Abdullah Abdullah (left) stands with President Ashraf Ghani, Vice President Joe Bidden, Defense Secretary Ash Carter and Maj. Gen. Jeffrey Buchanan at a wreath-laying ceremony at the Tomb of the Unknowns on Tuesday. Andrew Harnik/AP hide caption

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A couple enjoys the view of Singapore's financial center. Conservatives saw Singapore as a free-market success story, but Lee Kuan Yew's government played a big role in the economy. Wong Maye-E/AP hide caption

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Wandsworth prison in south London in a 2010 photo. Neil Moore, a 28-year-old convicted fraudster, walked out of the prison earlier this month by showing guards a bail letter he'd forged. Andrew Winning /Reuters/Landov hide caption

itoggle caption Andrew Winning /Reuters/Landov

Nigeria's President Goodluck Jonathan, left, and opposition candidate Gen. Muhammadu Buhari, right, prepare to sign a renewal of their pledge to hold peaceful "free, fair, and credible" elections, at a hotel in the capital Abuja, Nigeria, on Thursday. Ben Curtis/AP hide caption

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A German police investigator carries a box after searching an apartment believed to belong to the crashed Germanwings flight 4U 9524 co-pilot Andreas Lubitz in Duesseldorf, on Thursday. Wolfgang Rattay/Reuters/Landov hide caption

itoggle caption Wolfgang Rattay/Reuters/Landov

A Palestinian Bedouin girl milks a sheep in her family's makeshift camp in the West Bank. Herders live close to their animals, their main source of income. Emily Harris/NPR hide caption

itoggle caption Emily Harris/NPR