The Nasdaq composite index briefly fell more than 1 percent while the Dow and S&P 500 extended losses in afternoon trading on Tuesday, with the S&P 500 weighed down by materials and energy shares following declines in commodity prices.

The Dow Jones industrial average <.DJI> dipped 27.93 points, or 0.24 percent, to 11,642.82. The Standard & Poor's 500 Index <.SPX> dropped 8.28 points, or 0.65 percent, to 1,263.59. The Nasdaq Composite Index <.IXIC> fell 24.77 points, or 0.92 percent, to 2,666.75, after declining more than 1 percent.

(Reporting by Caroline Valetkevitch; Editing by Kenneth Barry)