Dow Jones industrial average falls 500 points, extending a week-long slump.
Spencer Platt
<p>NEW YORK, NY - OCTOBER 11: Traders work on the floor of the New York Stock Exchange (NYSE) on October 11, 2017 in New York City. The Dow Jones Industrial Average was up 4.04 points, or 0.02 percent, at 22,834.72 in morning trading as investors wait for third quarter results from many large banks on Thursday. (Photo by Spencer Platt/Getty Images)</p>
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