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Abdelmalek Sellal, Algeria's prime minister, from right, David Cameron, U.K. prime minister, Shinzo Abe, Japan's prime minister, and Mauricio Macri, Argentina's president, stand during a family photo at the Nuclear Security Summit in Washington, D.C., U.S., on Friday, April 1, 2016. After a spate of terrorist attacks from Europe to Africa, U.S. President Barack Obama is rallying international support during the summit for an effort to keep Islamic State and similar groups from obtaining nuclear material and other weapons of mass destruction. <br />
Credit: Andrew Harrer / Pool via CNP/MediaPunch
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