Police attend a launch event for the Group of 20 (G20) 2016 summit in Hangzhou, capital of east China's Zhejiang Province, May 27, 2016. Security staff gathered here on Friday to attend the launch event for the G20 2016 summit. China will host the G20 summit in Hangzhou on Sept. 4-5. (Xinhua/Wang Dingchang)
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