Wall St ends flat

U.S. stocks closed mixed in sluggish trading,with Dow breaking 5-day of gains amid ongoing concerns over the debt ceiling.
Dow Jones Industrial Average fell 23.66 points, or 0.17 per cent to close at 13,511.23.
S&P 500 added 0.29 points, or 0.02 per cent at 1,472.63.
Nasdaq composite gained 6.76 points, or 0.22 per cent at 3,117.54.
Among key S&P sectors, telecoms and materials slipped, while techsand energy gained.