U.S. stocks sell off on Europe debt worries By: MarketWatch July 11, 2011 at 10:34 AM EDT U.S. stocks start Monday’s session with a broad, deep decline, as surging benchmark yields in Italy fostered worries of a spreading European debt crisis. Read More >> Related Stocks: Alcoa Bank of America Hewlett-Packard JPMorgan Chase & Co McDonald's Corp Standard & Poors 500