Stocks are opening lower as more U.S. companies turn in their quarterly results and as investors worry about tensions with Russia over the downed airliner in Ukraine.
Hasbro fell 2 percent in early trading Monday after the toy maker reported second-quarter earnings and revenue that fell short of analysts' targets.
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The Standard & Poor's 500 index fell five points, or 0.2 percent, to 1,972.
The Dow Jones industrial average lost 56 points, or 0.4 percent, to 17,036. The Nasdaq composite slid four points, or 0.1 percent, to 4,426.
European markets also fell. Germany's DAX sank 1.1 percent and France's CAC-40 lost 0.7 percent.
Bond prices rose. The yield on the 10-year Treasury note fell to 2.47 percent.