Wall Street hit by euro zone concerns

Dow Jones, S&P 500 index and Nasdaq down 0.5% each

U.S. stocks fell on Friday on resurging concern about Europe as a region of Spain said it would seek the central government's help to repay its debt.

The Dow Jones industrial average was down 67.13 points, or 0.52 percent, at 12,876.23. The Standard & Poor's 500 Index was down 5.27 points, or 0.38 percent, at 1,371.24. The Nasdaq Composite Index was down 10.39 points, or 0.35 percent, at 2,955.51.