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United States President Barack Obama, center, speaks as Xi Jinping, China's president, right, and Francois Hollande, France's president, left, listen during a P5+1 multilateral meeting 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, 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