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Wall Street falls after Greek debt downgrade



    NEW YORK (Reuters) - U.S. stocks fell to session lows on Tuesday after the credit ratings for both Greece and Portugal were cut, intensifying worries over their sovereign debt.

    * The CBOE Volatility Index , known as Wall Street's fear gauge, jumped 17 percent following the downgrade of Greek ratings into junk territory.

    * The Dow Jones industrial average dropped 146.61 points, or 1.31 percent, to 11,058.42. The Standard & Poor's 500 Index lost 19.30 points, or 1.59 percent, to 1,192.75. The Nasdaq Composite Index gave up 34.53 points, or 1.37 percent, at 2,488.42.

    (Reporting by Leah Schnurr; editing by Jeffrey Benkoe)