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The Hang Seng Index fell 0.83 percent, or 252.84 points, to 30,062.75, marking a fourth straight loss.
The benchmark Shanghai Composite Index lost 1.41 percent, or 43.85 points, to 3,066.80. The Shenzhen Composite Index, which tracks stocks on China's second exchange, tumbled 2.20 percent, or 40.21 points, to 1,784.56.