http://d.yimg.com/a/p/rids/20100506/...0dsZBB9fQyig--Reuters - U.S. stocks were down more than 3 percent on Thursday afternoon after briefly nosediving, with the Nasdaq at one point down more than 9 percent and the S&P 500 and Dow briefly falling into negative territory for the year, as worries about contagion from Greece's debt problems mounted.
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