"Major Sell Program Trips 50-DMA, Sends Stocks Sliding"

DJIA down 214.57 at 16,995.49. S&P 500 down 25.01 at 1973.29. More to come.
From ZeroHedge:

A "huge" institutional sell order, covering almost 200 individual stocks, is rumored to have been responsible for getting this morning's weakness across stocks going as equity indices catch down to bonds and credit. The S&P 500 broke key support at its 50-day moving-average (for first time in 2 months) and is back at 6 week lows. The Russell 2000 is now down 4.25% from the FOMC meeting last week...
S&P 500 cash breaks key technical

And from FOMC, it's all red again...