U.S.MARKET UPDATE

The Dow and S&P 500 ended a volatile session higher on Tuesday, helped by strong earnings from Merck and gains in IBM after it boosted its dividend, while the Nasdaq fell with Apple.

Adding to volatility just before the close, shares of Twitter dropped as much as 24 percent after its results were published early. The stock closed down 18.2 percent at $42.27.

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