The Dow and S&P 500 indexes opened lower on Monday amid worries about Europe's debt situation after Spain bailed out a local bank.

The Dow Jones industrial average <.DJI> was down 35.67 points, or 0.35 percent, at 10,157.72. The Standard & Poor's 500 Index <.SPX> was down 3.00 points, or 0.28 percent, at 1,084.69. The Nasdaq Composite Index <.IXIC> was up 4.23 points, or 0.19 percent, at 2,233.27.

(Reporting by Caroline Valetkevitch)