Stocks fell on Thursday on concerns that the Federal Reserve's latest efforts to stem the U.S. recession are too costly and untested, prompting investors to book profits on bank shares after a recent run-up.

KBW bank index <.BKX> falls 9.1 percent.

U.S. dollar slips; commodities edge higher.

The Dow Jones industrial average <.DJI> fell 85.78 points, or 1.15 percent, to end unofficially at 7,400.80. The Standard & Poor's 500 Index <.SPX> dropped 10.31 points, or 1.30 percent, to 784.04. The Nasdaq Composite Index <.IXIC> slipped 7.74 points, or 0.52 percent, to 1,483.48.

(Reporting by Rodrigo Campos; Editing by Jan Paschal)