Wall Street opened higher on Wednesday on bargain hunting after a recent sell-off and as U.S. Treasury Timothy Geithner flew to Europe to press for united action to tackle the region's deepening debt crisis.

The Dow Jones industrial average <.DJI> was up 78.90 points, or 0.79 percent, at 10,122.65. The Standard & Poor's 500 Index <.SPX> gained 10.79 points, or 1 percent, at 1,084.82. The Nasdaq Composite Index <.IXIC> rose 28.73 points, or 1.30 percent, at 2,239.68.

(Reporting by Angela Moon; editing by Jeffrey Benkoe)