Wall Street opens lower on last day of quarter

(Reuters) - Stock opened lower on Friday as investors locked in gains at the end of a strong quarter for equities and amid uncertainty ahead of the result of stress tests on Spanish banks.

The Dow Jones industrial average <.DJI> dropped 64.97 points, or 0.48 percent, to 13,421.00. The Standard & Poor's 500 Index <.SPX> dropped 4.98 points, or 0.34 percent, to 1,442.17. The Nasdaq Composite Index <.IXIC> dropped 11.50 points, or 0.37 percent, to 3,125.10.

(Reporting by Atossa Araxia Abrahamian; Editing by Bernadette Baum)