• A Chinese stock investor reacts near a display for stock prices at a brokerage house in Qingdao in eastern China's Shandong province Tuesday, Aug. 25, 2015. Chinese stocks tumbled again Tuesday after their biggest decline in eight years while most other Asian markets rebounded from a day of heavy losses. (Chinatopix via AP) CHINA OUT

    A Chinese stock investor reacts near a display for stock prices at a brokerage house in Qingdao in eastern China's Shandong province Tuesday, Aug. 25, 2015. Chinese stocks tumbled again Tuesday after their biggest decline in eight years while most ... other Asian markets rebounded from a day of heavy losses. (Chinatopix via AP) CHINA OUT (The Associated Press)

  • A man takes a photo of an electronic stock indicator of a securities firm in Tokyo, Tuesday, Aug. 25, 2015. On Tuesday, Japan's main share index, the Nikkei 225, sank 4 percent to 17,806.70 in a session that saw the benchmark swing between positive and negative territory. It fell 4.6 percent on Monday. (AP Photo/Shizuo Kambayashi)

    A man takes a photo of an electronic stock indicator of a securities firm in Tokyo, Tuesday, Aug. 25, 2015. On Tuesday, Japan's main share index, the Nikkei 225, sank 4 percent to 17,806.70 in a session that saw the benchmark swing between positive ... and negative territory. It fell 4.6 percent on Monday. (AP Photo/Shizuo Kambayashi) (The Associated Press)

  • Chinese stock investors monitor stock prices at a brokerage house in Jiujiang in central China's Jiangxi province Tuesday, Aug. 25, 2015.  Chinese stocks tumbled again Tuesday after their biggest decline in eight years while most other Asian markets rebounded from a day of heavy losses. (Chinatopix via AP) CHINA OUT

    Chinese stock investors monitor stock prices at a brokerage house in Jiujiang in central China's Jiangxi province Tuesday, Aug. 25, 2015. Chinese stocks tumbled again Tuesday after their biggest decline in eight years while most other Asian markets ... rebounded from a day of heavy losses. (Chinatopix via AP) CHINA OUT (The Associated Press)

China's stock market index falls for 4th day, sinking 7.6 percent to 8-month low

Energy Associated Press

China's main stock market index has fallen for a fourth day, plunging 7.6 percent to an eight-month low.

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In Japan, the Nikkei 225 index, which had risen earlier Tuesday, closed down 3.9 percent at 17,806.70.

The Shanghai Composite Index closed Tuesday down 244.94 points to 2,964.97 amid sharp declines that have rattled investors abroad and triggered a global stock sell-off. It tumbled 8.5 percent Monday.

Chinese stocks have plunged over the last two weeks despite a multibillion-dollar government effort to stop a slide in prices.