Stocks are closing lower as U.S. companies turn in mixed quarterly results and as investors worry about tensions with Russia over the downed airliner in Ukraine.
Hasbro fell 3 percent Monday after the toy maker reported second-quarter earnings and revenue that fell short of analysts' targets.
Six Flags Entertainment fell 4 percent after the theme-park operator reported revenue that came up short of what investors expected, partially a result of sluggish attendance.
The Standard & Poor's 500 index fell four points, or 0.2 percent, to 1,973.
The Dow Jones industrial average lost 48 points, or 0.3 percent, to 17,051. The Nasdaq composite slid seven points, or 0.2 percent, to 4,424.
Bond prices rose. The yield on the 10-year Treasury note fell to 2.47 percent.