* U.S. stocks plunge after shift in U.S. bailout program
* U.S. crude futures drop to 21-month low under $56 barrel
* Government debt advances as stock losses spur safety bid
* Yen soars across the board, dollar to yen falls below 95 (Corrects to say "capital needs of both banks and non-bank financial institutions" in paragraph 2, instead of just "non-bank financial institutions")
By Herbert Lash
NEW YORK, Nov 12 (Reuters) - U.S. stocks plunged on Wednesday after a shift in how the U.S. government will use its $700 billion bailout fund fed uncertainty and oil prices slid to 21-month lows on fears of a deep global recession.
U.S. Treasury Secretary Henry Paulson said he was backing away from buying troubled mortgage assets and would focus on the capital needs of both banks and non-bank financial institutions.
Banking shares took the brunt of the government's shift in how to address a credit crisis whose genesis lies in the slumping U.S. housing market. Shares of Citigroup <C.N> fell below $10 for the first time since it became a public company.
The shift in government plans caught investors off-guard.
"A lot of clarity is missing," said Paul Nolte, director of investments at Hinsdale Associates in Hinsdale, Illinois.
"It's just a different direction, and every time that we hear about this, we're bailing somebody else out and we're throwing money in another direction without having a clear plan or objective in mind."
Paulson's comments also underscored the head winds the U.S. economy faces, adding to the slide in stocks and feeding a bid for such safe-haven assets as government debt and the yen.
The threat of deflation, which would hurt corporate profits, also slammed stocks and made risk-averse investors steady buyers of U.S. Treasuries.
Sterling tumbled to a six-year low against the dollar and a record trough against the euro after the Bank of England warned the British economy will shrink sharply next year. Its governor bolstered expectations of aggressive interest rate cuts.
The pound traded as low as $1.4898 <GBP=>, the weakest level since June 2002, and the U.S. dollar fell sharply against the yen as investors shunned riskier assets.
Oil fell more than 5 percent to less than $56 a barrel at one point after the U.S. government again chopped its forecast for global demand due to slowing economic growth around the world.
U.S. crude <CLc1> ,which peaked at more than $147 a barrel in July, fell $3.17 to settle at $56.16 a barrel, its lowest settlement since January 2007.
Fresh signs of economic weakness also pummeled stocks. The top U.S. electronics retailer. Best Buy, warned that the business climate was the worst in 40 years and said consumer spending is falling fast, adding more evidence of pending economic gloom.
The Dow Jones industrial average <
> closed down 411.30 points, or 4.73 percent, at 8,282.66. The Standard & Poor's 500 Index <.SPX> was down 46.65 points, or 5.19 percent, at 852.30. The Nasdaq Composite Index < > was down 81.69 points, or 5.17 percent, at 1,499.21.The technology-rich Nasdaq marked its lowest close since May 2003, and the S&P's close was less than 4 points off a 5-1/2-year low.
Shares of Best Buy <BBY.N> fell 8 percent, and the S&P retail index <.RLX> fell 5.8 percent.
Banking shares fell harder, with the S&P financial index down 6.9 percent. Bank of America <BAC.N> fell 9 percent and American Express <AXP.N> fell 10.5 percent.
Data from Europe added to the gloom. Euro zone industrial production fell a larger-than-expected 1.6 percent, while British unemployment rose to its highest level in more than a decade in the three months to September.
The Bank of England said the British economy would shrink sharply next year and inflation could be less than 1 percent.
News from Europe "just reinforced market expectations that global recession is still in the cards," said Ronald Simpson, managing director of global currency analysis for Action Economics in Tampa, Florida. "We're probably going to continue to see downward pressure on the euro and the pound in particular."
European shares slid, led by banks and oil companies on worries of more losses and a darkening economic picture, and as Wall Street fretted over changes to the U.S. government's financial sector bailout plan.
The FTSEurofirst 300 <
> index of top European shares ended 3.4 percent lower at 853.88 points.BP <BP.L>, StatoilHydro <STL.OL> and Banco Santander <SAN.MC> were the biggest drags on the benchmark index.
BP fell 4.6 percent, StatoilHydro shed 10.7 percent and Santander fell 7.6 percent.
The benchmark 10-year U.S. Treasury note <US10YT=RR> rose 29/32 in price to yield at 3.65 percent. The 2-year U.S. Treasury note <US2YT=RR> rose 6/32 in price to yield 1.17 percent.
The dollar rose against a basket of major currencies, with the U.S. Dollar Index <.DXY> up 0.56 percent at 87.559.
The euro <EUR=> was down 0.33 percent at $1.2476, and against the yen, the dollar <JPY=> fell 2.90 percent at 94.86.
U.S. gold futures for December delivery <GCZ8> settled down $14.50 at $718.30 an ounce in New York.
Japan's Nikkei average <
> shed 1.3 percent on the lightest volume in about six weeks, while the MSCI benchmark index of Asian stocks outside of Japan <.MIAPJ0000PUS> lost 0.8 percent. (Reporting by Leah Schnurr, Wanfeng Zhou, Ellen Freilich and Frank Tang in New York and Christopher Johnson, George Matlock and Sitaraman Shankar in London; writing by Herbert Lash; Editing by Leslie Adler)