Stock Index Futures Move Down

September SP500 is trading at 2169.00, down 7.75. September Nasdaq 100 is trading at 4781.25, down 17.25 September Russell 2000 is trading at 1223.40, down 6.50. September Dow Industrial futures are trading at 18466, down 58. Stock index futures are have extended the session losses, trading is modestly choppy.