Uncertainty about how quickly China’s economy is weakening continued to hammer U.S. stock markets on Thursday, sending the Dow Jones industrial average down 392 points – or 2.3 percent of its total value — for its biggest loss in three months.

Reuters reported that the Dow’s 5.2 percent decline in the first four trading days was its worst performance to begin a year since the 30-stock index’s creation in 1928.

The Standard & Poor’s 500 index and the Nasdaq composite also were creamed, with the former losing 47 points, or 2.4 percent, and the latter sliding 146 points, or 3 percent.

The Dow and Nasdaq ended the day more than 10 percent below…

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