Barriers are seen near 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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Barriers are seen near 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)
