Wall St ends lower

U.S. stocks posted its worst day since June after two Federal Reserve Presidents said the central bank could begin curbing easy money policy as early as this September.
The S&P 500 index fell 9.77 points to close at 1,697.37, dropping below the 1,700-mark.
Nasdaq lost 27.18 points to close at 3,665.77, snapping a 5-day gain streak.
All key S&P sectors closed in lower on materials and financials shares.