Sept. 5 (Bloomberg) — U.S. stock futures fell, indicating the Standard & Poor’s 500 Index may slide for a third day when exchanges open tomorrow, as European markets showed growing concern the sovereign debt crisis is worsening.

Bank of America Corp. declined 5.9 percent and Citigroup Inc. dropped 4.9 percent in German trading as banks led the Stoxx Europe 600 Index to a 4.1 percent retreat. Alcoa Inc., the largest U.S. aluminum producer, slumped 3 percent in Germany.

S&P 500 futures expiring in September lost 2 percent to 1,145.60 at 11:50 a.m. in New York. U.S. markets are closed for the Labor Day holiday. The MSCI All-Country World Index fell 2 percent as Italian bonds dropped for an 11th day, Spanish debt declined and the cost of government and bank default insurance rose to records.

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