More tensions in Ukraine left the stock market slightly lower in quiet trading.
Investors were also poring over a speech by Federal Reserve Chair Janet Yellen, which gave few clues about the central bank's next moves on interest rates.
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Trading was unusually quiet with many investors on vacation.
The Dow Jones industrial average lost 38 points, or 0.2 percent, to close at 17,001 Friday.
The Standard & Poor's 500 index fell four points, or 0.2 percent, to 1,988. The Nasdaq composite index rose six points, or 0.1 percent, to 4,538.
Aeropostale plunged 10 percent after forecasting a big loss in the current quarter. Gap rose 5 percent after reporting a surge in profits.
Bond prices rose. The yield on the 10-year Treasury note fell to 2.40 percent.