Looks like there was an after-hours flash crash in the SPDR S&P 500 ETF SPY…printed low at 106.46. Spent awhile digging through T&S data and can't find it in Power E*Trade Pro. Still no official word from NYSE ARCA and there's general confusion across Twitter.
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Update 1: Looks like that was the official closing price on NYSE, not afterhours. However, no trade at that price is showing up in time&sale data between 13:59 and 14:00 for me.
Update 2: Comment on ZH claims the 106.46 trade was worth $7M.