S&P tests support…
The US stock indices are trading near session lows with the S&P trading down -0.53% and the Nasdaq composite down -0.64%. 
Looking at the S&P index on the hourly chart, the index is testing trend line support and the 200 hour MA (at 2268.91). The low has extended to 2267.21 (the trend line cuts across at 2267.33).  Yesterday, the 200 hour MA was tested and the price bounced higher into the close (stalled at the 50 hour MA actually).