The 11-point decline in the S&P 500 today to 1687 breaks the 38.2% retracement of the September gain.
With a government shutdown and the debt ceiling looming, there are plenty of reasons to worry even if the Fed has promised to print forever.
SP500 daily chart with 55-day MA
Falling stocks are weighing on USD/JPY (which just hit a two-week low). The next layer of support is in the 1680/1678 zone.