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The Hang Seng Index shed 1.41 percent, or 409.54 points, to close at 28,545.57 as it reopened after an extended weekend break.
The benchmark Shanghai Composite Index gained 0.41 percent, or 11.33 points, to 2,786.89 and the Shenzhen Composite Index, which tracks stocks on China's second exchange, rose 0.76 percent, or 11.98 points, to 1,594.24.