Stock Index Futures Edge Lower

March SP500 is trading at 2258.50, down 14.00. March Nasdaq 100 is trading at 5032.75, down 28.50. March Russell 2000 is trading at 1351.30, down 22.80. March Dow Industrial futures are trading at 19709, down 123. Stock index futures are trading choppy, some futures have extended the session losses.