The S&P 500 closed flat on Monday as worries about the European debt crisis and weaker US data kept investors wary of equities.

The Dow Jones industrial average dipped 17.11 points, or 0.14 percent, to end unofficially at 12,101.46. The S&P 500 Index edged up just 0.14 of a point, or 0.01 percent, to finish unofficially at 1,278.18. The Nasdaq Composite gained 12.53 points, or 0.46 percent, to close unofficially at 2,760.01.

Gains of 3 percent in the shares of both Amazon and Starbucks helped the Nasdaq outperform the other top US equity indexes. - Reuters