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Dow plunges 512 points

Reuters News
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August 04, 2011 AT 7:19 PM
Summary Business Headlines: Investors throw in the towel and Wall Street posts worst day since the Great Recession, Worries mount about U.S. economic growth and escalating debt crisis in Europe; Investors seek safety in U.S. Treasuries and 10-year note yield falls below 2.5%.