Wall St ends lower

US stocks ended in negative territory, with the S&P 500 snapping a 6-day of gains amid concerns over lack of progress in "fiscal cliff" negotiations in the U.S. 
Dow Jones Industrial Average fell 74.73 points, or 0.56 per cent, to close at 13,170.72.
S&P 500 fell 9.03 points, or 0.63 per cent at 1,419.45.
Nasdaq lost 21.65 points, or 0.72 per cent at 2,992.16.
All key S&P sectors finished in the red, led by energy and health care.