NEW YORK, May 7 - U.S. stocks extended losses on Thursday, pulling the Nasdaq down almost 3 percent, after a government bond auction drew a poor response and investors worried the rising costs of capital could hamper the economy's recovery.

* All indexes were at session lows, with financials, technology and materials sectors among the top drags.

* The Dow Jones industrial average .DJI was down 118.75 points, or 1.40 percent, at 8,393.53. The Standard & Poor's 500 Index .SPX was down 13.83 points, or 1.50 percent, at 905.70. The Nasdaq Composite Index .IXIC was down 47.81 points, or 2.72 percent, at 1,711.29.

(Reporting by Ellis Mnyandu; editing by Padraic Cassidy)

U.S.