U.S. stocks tumbled more than 1 percent on Monday, with the energy sector leading the S&P 500's losses. Oil prices fell below $70 a barrel, down $2.

The Dow Jones industrial average <.DJI> was down 155.08 points, or 1.46 percent, at 10,465.08. The Standard & Poor's 500 Index <.SPX> was down 17.74 points, or 1.56 percent, at 1,117.94. The Nasdaq Composite Index <.IXIC> was down 33.72 points, or 1.44 percent, at 2,313.11.

(Reporting by Caroline Valetkevitch; Editing by Jan Paschal)