The U.S. stock market plummeted after a rocky of day of trading on Thursday.
The Dow Jones industrial average fell 391.01 points, or 3.51 percent, closing at 10,733.83. The NASDAQ ended the day down 3.25 percent at 2,455.67.
Early in the day, the Dow was down more than 500 points. U.S. stock markets started a sell-off Wednesday after the Fed announced its latest effort to boost the economy but added that there are "significant downside risks" to the global economy.
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