Wall St ends flat

U.S. stocks closed flat after disappointing euro zone economic data overshadowed jobless claims report optimism.
Dow Jones Industrial Average slipped 9.52 points, to close at 13,973.39.
S&P 500 index added 1.05 points to end at 1,521.38.
Nasdaq composite gained 1.78 points, to close at 3,198.66.
Among key S&P sectors, telecoms closed lower, while energy gained.