US shares close little changed
(Close): US shares end the day flat, having traded lower for most of the session.
The Nasdaq however, managed a small gain of 8 points to close at 5,284, helped by a 0.6% rise in Apple shares as it launched its new iPhone.
Shares in the grocery chain Sprouts Farmers Market fell more than 13% after a disappointing profit forecast.
That news also hit its rival Whole Foods, with its shares falling more than 5%.