* U.S. stocks sag; rescue plans highlights bank weakness
* Dollar pares gains on concerns rescue plan isn't enough
* Government debt prices rally on flight-to-safety buying
* U.S. banks plunge to multiyear lows on no end to crisis (Adds close of U.S. markets)
By Herbert Lash
NEW YORK, July 14 (Reuters) - Fear about fallout from the credit crisis, especially among banks, overshadowed initial enthusiasm over a rescue plan for the top two U.S. mortgage finance companies on Monday, dragging down stocks and increasing a safe-haven bid for government bonds and gold.
Shares of Fannie Mae and Freddie Mac soared at first after the U.S. government and the Federal Reserve said on Sunday they would lend the two companies money and buy their stock if needed to shore up the two pillars of the U.S. housing market.
But the gains soon fizzled as analysts and investors noted any direct government investment in Fannie Mae <FNM.N> and Freddie Mac <FRE.N> would further dilute shares that lost more than 40 percent of their value last week alone.
The seizure of mortgage lender IndyMac Bancorp Inc <IMB.N>, late on Friday, the third largest bank failure in U.S. history, added to investor unease about bank stability and the future of the mortgage market.
The dollar clambered back from a near-record low against the euro, and U.S. and euro-zone government debt rose amid widespread concerns about global financial markets.
Of the 24 companies that make up the KBW Banks index <.BKX>, 19 traded at multiyear lows, and two others at more than 52-week lows. The index plummeted 8.5 percent.
The Dow Jones industrial average <
> closed down 45.35 points, or 0.41 percent, at 11,055.19. The Standard & Poor's 500 Index <.SPX> fell 11.20 points, or 0.90 percent, at 1,228.29. The Nasdaq Composite Index < > shed 26.21 points, or 1.17 percent, at 2,212.87.Freddie Mac passed its first test of investor confidence as buyers flocked to its $3 billion sale of debt. Although the routine auction went off without a hitch, investors remained wary and shares in both companies swung wildly.
"Markets are in effect agreeing that the debt is money good but the value of the equity is still in question," said Bret Barker, a portfolio manager at Metropolitan West Asset Management in Los Angeles.
Freddie shares closed down 8.3 percent to $7.11 and Fannie shares fell 5.1 percent to $9.73 in a day of whipsaw trade. Freddie fell as much as 32 percent and rose as much as 26.5 percent; Fannie gained almost 32 percent fell as much as 9.4 percent.
Regional banks tumbled. Shares of Washington Mutual <WM.N> plummeted 34.8 percent and National City Corp <NCC.N> plunged 14.7 percent amid fears about bank stability and the future of the mortgage market.
RBC Capital Markets analyst Gerard Cassidy said more than 300 banks could fail in the wake of IndyMac's collapse, double an estimate he made in February.
"The fear factor is in play right now," said Michael Nix, a portfolio manager at Greenwood Capital Associates.
With IndyMac failing, the cockroach theory was in full swing, said James Ellman, president of hedge fund Seacliff Capital, who is short some financial stocks.
"You don't just have one bank failure -- when you have a big bank go under, there's always more than one," Ellman said.
RELIEF RALLY IN EUROPE
The U.S. plan for Fannie and Freddie triggered a relief rally in Europe, with the pan-European FTSEurofirst 300 climbing as much as 1.8 percent before paring gains as investors focused anew on the wider credit crisis.
European shares rose in a session dominated by merger activity in banking and beermakers.
The FTSEurofirst 300 index <
> closed 0.7 percent higher at 1,133.95 points."There is a realization that there are still some fundamental factors which are creating negative sentiment in the global markets right now," said Barclays Stockbrokers strategist Henk Potts.
Banks were the top gainers, helped in part by the rescue plan and by Spain's Santander <SAN.MC>, which said it would buy British bank Alliance & Leicester <ALLL.L> for 1.3 billion pounds ($2.6 billion) in a cash and stock deal.
A&L surged 53 percent, while Santander rose less than 0.1 percent.
In the latest mega deal in the fast-consolidating beer industry, U.S. brewer Anheuser-Busch Cos Inc <BUD.N> accepted a sweetened $52 billion takeover bid from Belgium-based InBev NV <INTB.BR> to create the world's largest beermaker.
Anheuser shares rose 0.6 percent at $66.87. InBev was off 3.4 percent at 43 euros.
Safe-haven bonds initially fell as financial sector worries eased somewhat after the U.S. rescue plan was unveiled.
"For the moment, the market is still looking to see whether the U.S. rescue plan will be sufficient for Fannie Mae and Freddie Mac, but the jury is still out on that," said Bob Maes, fixed income strategist at KBC in Brussels.
Investors are waiting for testimony on Tuesday from Federal Reserve Chairman Ben Bernanke and the release of U.S. data, including retail sales, business inventory and producer prices, he said.
"So it's difficult to forecast how things will develop in the coming days," Maes said.
The benchmark 10-year U.S. Treasury note <US10YT=RR> rose 26/32 to yield 3.87 percent. The 30-year U.S. Treasury bond <US30YT=RR> added 44/32 to yield 4.46 percent.
"The (financial sector) crisis has not been resolved: there are clearly more shoes to drop," said John Canavan, market analyst at Stone & McCarthy in Princeton, New Jersey. "That means a significant, continued safe-haven bid for Treasuries."
The dollar rose against major currencies, with the U.S. Dollar Index <.DXY> up 0.20 percent at 71.94. Against the yen, the dollar <JPY=> fell 0.08 percent at 106.12.
The euro <EUR=> fell 0.20 percent at $1.5908.
Gold futures closed sharply higher, near $975 an ounce, as jittery investors poured into the market and as a record high in gold-backed exchange-traded funds boosted sentiment.
Bullion held by SPDR Gold Trust <GLD.P><GLD.A>, the world's largest gold-backed ETF, soared to a record 705.90 tonnes on Friday, up 7 percent from the previous day, its website showed.
August futures <GCQ8> for gold settled up $13.10 at $973.70 an ounce in New York.
Oil rose slightly as supply concerns in Brazil in the midst of an energy workers strike outweighed ongoing worries that high fuel costs are dragging down consumer demand.
U.S. crude <CLc1> settled up 10 cents to $145.18 a barrel, after hitting a record above $147 in intraday activity on Friday. London Brent crude <LCOc1> settled 57 cents lower at $144.93 a barrel.
Overnight, the U.S. dollar rose after the U.S. rescue plan was unveiled, but Asian shares dropped on the view that the global credit crisis is worse than previously thought.
Japan's Nikkei share average <
> closed 0.2 percent lower and Hong Kong's Hang Seng index < > fell 1.3 percent.Shares in Asia-Pacific companies outside of Japan fell 1.1 percent, according to an MSCI index <.MIAPJ0000PUS>. (Reporting by Ellis Mnyandu, Nick Olivari, Gertrude Chavez-Dreyfuss, Ellen Freilich and Frank Tang in New York, and Amanda Cooper, Ian Chua and Santosh Menonin London; Writing by Herbert Lash; Editing by Leslie Adler)