More info here:
http://www.zerohedge.com/news/2013-08-22/it-was-aapl-after-a...
"Nanex, which also uncovered the real quote-stuffing reason behine the May 2010 flash crash (and which the SEC tried to pin squarely on Waddell and Reed) has just disclosed that Nasdaq was already demonstrating explicit "glitches" in the trading of Apple well ahead of the 12:21 pm trading halt."