NEW YORK, Feb 10 (Reuters) - U.S. stocks tumbled on Tuesday, briefly dragging the S&P 500 down more than 5 percent, as lack of detail in the government's plan to shore up the financial system rattled investors and fueled doubts about steps taken to contain the economic meltdown.
* The S&P financial index .GSPF fell more than 10 percent while the KBW index of bank stocks .BKX tumbled 13.3 percent.
* The Dow Jones industrial average .DJI fell 387.57 points, or 4.69 percent, to 7,883.30. The Standard & Poor's 500 Index .SPX declined 43.33 points, or 4.98 percent, to 826.56. The Nasdaq Composite Index .IXIC lost 66.88 points, or 4.20 percent, to 1,524.68. (Reporting by Rodrigo Campos; Editing by Leslie Adler)