If you look at all the the four major indexes they all pulled back to rising 10 day moving average support. The ugly candle of the day goes to AAPL. It sold off over 4% on monster volume. You can blame curved displays.
Samsung unveiled Galaxy Note 4 and Galaxy Note Edge 4, which has a curved display. If this is why AAPL dropped 4% then I think it was an overreaction. You have to respect the volume but give me a break. Anyone have a curved TV? Thought so.