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Policemen patrol outside the Washington Convention Center prior to the Nuclear Security Summit in Washington, capital of the United States, April 12, 2010. Leaders or representatives of more than 40 countries, and international and regional organizations including the United Nations, the International Atomic Energy Agency and the European Union, will gather in Washington for the Nuclear Security Summit slated for April 12-13. [Zhang Jun/Xinhua]
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![Policemen patrol outside the Washington Convention Center prior to the Nuclear Security Summit in Washington, capital of the United States, April 12, 2010. Leaders or representatives of more than 40 countries, and international and regional organizations including the United Nations, the International Atomic Energy Agency and the European Union, will gather in Washington for the Nuclear Security Summit slated for April 12-13. [Zhang Jun/Xinhua]](http://images.china.cn/attachement/jpg/site1007/20100413/000cf1bdd03f0d2e1cba19.jpg "Policemen patrol outside the Washington Convention Center prior to the Nuclear Security Summit in Washington, capital of the United States, April 12, 2010. Leaders or representatives of more than 40 countries, and international and regional organizations including the United Nations, the International Atomic Energy Agency and the European Union, will gather in Washington for the Nuclear Security Summit slated for April 12-13. [Zhang Jun/Xinhua]")
