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Dow, S&P 500 down at open



    NEW YORK (Reuters) - The Dow and S&P 500 opened slightly lower on Thursday as oil prices hovered near $100 a barrel amid increasing concern about unrest in Libya. The Nasdaq was a touch higher.

    The Dow Jones industrial average was down 8.86 points, or 0.07 percent, at 12,096.92. The Standard & Poor's 500 Index was down 1.30 points, or 0.10 percent, at 1,306.10. The Nasdaq Composite Index was up 1.72 points, or 0.06 percent, at 2,724.71.

    (Reporting by Caroline Valetkevitch)