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April 1, 2016 - Washington, District of Columbia, U.S. - United States President BARACK OBAMA, center, and MARK RUTTE, Dutch prime minister, center right, wave among other heads of state including XI JINPING, China's president, right, and attendees during a family photo at the Nuclear Security Summit. 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. (Credit Image: © Andrew Harrer/Pool/CNP via ZUMA Wire)