Stocks mostly lower on Wall Street; Yum plunges

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Aluminum maker Alcoa reports earnings after the closing bell. The stock was flat in early trading.

The Dow Jones industrial average slipped 20 points to 13,362 early Tuesday. The Standard & Poor's 500 index fell a point to 1,460. The Nasdaq rose three to 3,101.

Yum Brands, the parent company of KFC, Pizza Hut and Taco Bell, dropped 4 percent to $65.13 after saying that problems with two of its small chicken suppliers hurt sales more than expected in China.

Agricultural products company Monsanto rose 4 percent to $99.48 after reporting that its profit nearly tripled as sales of its corn seeds expanded in Latin America.

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