Stocks are opening lower as investors react to more disappointing earnings from companies.
L-3 Communications Holdings plunged 14 percent, the most in the Standard & Poor's 500 index, after the company reported that it was investigating accounting irregularities at is Aerospace Systems unit.
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Yum Brands lost 6 percent after the owner of the KFC and Pizza Hut fast-food chains said a food safety scandal in China is hurting its sales.
The S&P 500 index fell 15 points, or 0.8 percent, to 1,955 in the first few minutes of trading Thursday.
The Dow Jones industrial average lost 120 points, or 0.7 percent, to 16,761. The Nasdaq composite fell 38 points, or 0.9 percent, to 4,424.
Bond prices fell. The yield on the 10-year Treasury note rose to 2.58 percent.