Chinese stocks plunged on Thursday, triggering the second emergency market closure this week and resulting in the shortest trading day in the market's 25-year history. The CSI 300 index of companies listed in Shanghai and Shenzhen fell 7.2 percent in less than 30 minutes before trading halted. Analysts said a sharp devaluation in China's currency hurt market confidence, sparking a panic that dragged down share prices from Japan to Europe.

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