US equity markets retreated as the weekend attacks on Saudi Arabia's key oil facilities unsettled investors on the eve of the Federal Reserve's latest two day monetary policy meeting - Dow down -143-points or -0.52%, snapping an eight session winning streak. The broader S&P500 slipped -0.31% despite a +3.29% gain for the Energy sector. General Motors fell -4.3% after United Auto Workers union went on strike. The NASDAQ dipped -0.28%. Investors also eyed some soft China economic data released yesterday (16 September).