The S&P 500 finished the session off 0.42 points, or 0.03 percent, to close at 1337.89.
The Nasdaq 100 dropped 18.26 points, or 0.71 percent, to 2549.20. Heavily weighted Apple cut some of its overnight losses but still ended more than 4 percent lower to $574.97.
Performing best on the day was the Russell 2000, which added 1.56 points, or 0.2 percent, to close at 769.31.
S&P 500
Resistance is now 1338, followed by 1340, 1343.91, 1349.50, and 1355.76.Nasdaq 100
Support is now 1337, followed by 1335, 1329.24 (yesterday's low), and 1325.
Resistance is now 2550, followed by 2557.58, 2560, and 2568.Russell 2000
Support is now 2549, followed by 2543.22, 2535.04 (yesterday's low), and 2525.
Resistance is now 770, followed by 771.02, 773.50, and 775.
Support is now 769, followed by 767.65, 765.87, and 760.
