The Market Reversal Was Sharp

Usually we don't see too many "V" reversals whether intraday or daily, this I think qualifies and there's usually a trigger (for instance JPM yesterday). I'm looking for what the trigger was.

 Here you can see the reversal was quite sharp around 1:30 EDT in the SPY

 The Q's may have been even sharper, the market is now at intraday lows or within a few cents of them in all of the major averages.

 As usual, day traders were stopped out on the break of the 50-bar  5 min moving average.

The only thing I've seen yet that may be the reason is an intraday reversal in AAPL, but I need to check Briefing.com to see if there's some news out.