
U.S. stocks closed flat in thin trading overnight amid ongoing concerns over Europe's economy.
Dow Jones Industrial Average erased 0.23 points, to end at 12,815.16.
S&P 500 gained 0.15 points at 1,380.00. Among key S&P sectors, telecoms and industrials rose, while utilities and techs lagged.
Nasdaq composite fell 0.61 points at 2,904.26.