NEW YORK (MarketWatch) - U.S. stocks fell sharply Tuesday as worries about European debt and the U.S. economy intensified. The Dow Jones Industrial Average DJIA -2.41% fell 275.26 points to 10,965.00. The Standard & Poor's 500 Index SPX -2.46% shed 29.60 points to 1,144.37. The Nasdaq Composite Index COMP -2.13% declined 56.61 points to 2,423.72. Following a sharp drop in stock-index futures ahead of Wall Street's start, the New York Stock Exchange and NYSE Amex Cash Markets invoked Rule 48 for the open, lifting a requirement calling for price indications that help determine the floor price at the start to smooth trade.

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