Workers prepare for the Nuclear Security Summit at the Walter E. Washington Convention Center in Washington, D.C., March 30, 2016. The fourth Nuclear Security Summit will be held here March 31-April 1, 2016. (Photo: Xinhua/Yin Bogu)
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Workers prepare for the Nuclear Security Summit at the Walter E. Washington Convention Center in Washington, D.C., March 30, 2016. The fourth Nuclear Security Summit will be held here March 31-April 1, 2016. (Photo: Xinhua/Yin Bogu)
