The Dow and S&P 500 added to losses on Monday, led by declines in the energy sector as oil prices fell, while the Nasdaq turned lower.

The Dow Jones industrial average <.DJI> was down 51.54 points, or 0.49 percent, at 10,568.62. The Standard & Poor's 500 Index <.SPX> fell 5.46 points, or 0.48 percent, at 1,130.22. The Nasdaq Composite Index <.IXIC> dipped 5 points, or 0.21 percent, at 2,341.85.

(Reporting by Caroline Valetkevitch; editing by Jeffrey Benkoe)