The Dow Jones industrial average fell 40 points, or 0.2 percent, to 16,873 in the first few minutes of trading Friday.
The Standard & Poor's 500 index lost four points, or 0.2 percent, to 1,960. The Nasdaq composite fell four points, or 0.1 percent, to 4,391.
Investors were assessing company earnings.
The S&P 500 index is poised for its biggest weekly loss since April after closing out the previous week at a record high. It's down 1.2 percent so far this week.
Bond prices rose. The yield on the 10-year Treasury note fell to 2.52 percent.
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