(Recasts with U.S. markets, changes dateline; previous LONDON)
* Global shares extend losses after Paulson statement
* U.S. Treasury debt prices pare losses after statement
* Dollar loses more ground versus the euro and yen
* Oil hits new record high on Mideast tensions
By Herbert Lash
NEW YORK, July 11 (Reuters) - Global stocks fell sharply and the dollar slid on Friday, weighed down by growing credit fears as the two largest U.S. mortgage finance companies plunged on concerns over a report that the government is considering taking them over.
Stocks extended losses after U.S. Treasury Secretary Henry Paulson said at mid-morning that his department's chief aim is to back Fannie Mae <FNM.N> and Freddie Mac <FRE.N> in their "current form."
"The bottom line is that we're in the middle of a financial Tsunami. This is a storm the likes of which this country hasn't seen," said Peter Kenny, managing director at Knight Equity Markets in Jersey City, New Jersey.
Investors' initial reaction was to view Paulson's statement as an indication that a bailout of the two companies -- pillars of the U.S. property market and economy -- was not imminent but still possible.
Wall Street investors reacted as if the bailout would effectively wipe out much of the common stock of the private companies set up to finance home ownership and holding over $5 trillion in montage assets. The shares of the two tumbled to a fraction of their value just weeks ago.
Moreover investors feared the impact of a protracted financial crisis on the economy, the markets and on demand for U.S. debt globally. The U.S. stock market, bonds and the dollar all fell, with equities hit the hardest.
Bill Sullivan, chief economist at JVB Financial Group in Boca Raton, Florida, said Paulson's statement that the mortgage companies would stay "in current form" was key to his message given in response to speculation that either one or both of the government-sponsored entities would enter conservatorship.
"That suggests that they want to avoid a conservator entity for these GSEs. That suggests avoiding a bailout, at least initially," Sullivan said. "There is not an imminent bailout on horizon," he said.
In late morning trade, the Dow Jones industrial average <
> was down 171.06 points, or 1.52 percent, at 11,057.96. The Standard & Poor's 500 Index <.SPX> was down 17.97 points, or 1.43 percent, at 1,235.42. The Nasdaq Composite Index < > was down 30.37 points, or 1.35 percent, at 2,227.48.The pan-European FTSEurofirst 300 index <
> was down 1.8 percent at 1,135.94 points, having slipped to 1,132.04 points -- its lowest since early July 2005.Euro zone and U.S. government bonds briefly pared losses Paulson's statement gave no hints of a bailout for Fannie and Freddie, whose shares plunged more than 40 percent each.
Those shares began to tumble in pre-market trade after The New York Times reported the U.S. government was considering a takeover -- a move that would guarantee the mortgages the two lenders hold, but that could leave shareholders with nothing.
European shares initially rose on the report, with investors relieved that Washington looked ready to step in to save the two massive lenders. But shares later fell sharply to three-year lows after Wall Street opened lower.
U.S. Treasury debt prices slipped on fears the government would need to sell more debt to back a potential takeover, and sparked a rally in Fannie and Freddie debt.
The benchmark 10-year U.S. Treasury note <US10YT=RR> fell 10/32 to yield 3.84 percent. The 30-year U.S. Treasury bond<US30YT=RR> fell 16/32 to yield 4.44 percent.
The dollar lost more ground versus the euro and yen after Paulson gave no indication of an imminent bailout. Investors fretted about the impact of the credit crisis.
The dollar fell against major currencies, with the U.S. Dollar Index <.DXY> down 0.78 percent at 71.93. Against the yen, the dollar <JPY=> fell 0.76 percent at 105.94.
The euro <EUR=> gained 1.11 percent at $1.5916.
U.S. light sweet crude oil <CLc1> rose $4.71 to $146.36 per barrel.
Spot gold prices <XAU=> rose $37.85 to $965.60 an ounce.
Gold rose to a three-month high, but in reaction to record oil prices as investors sought a hedge against inflation.
Oil jumped $5 to a new record high near $147 a barrel, spurred by growing worries of threats to supplies from Iran and Nigeria and the possibility of a strike by Brazilian oil workers next week.
Fannie and Freddie own or guarantee $5 trillion of debt, close to half of all U.S. mortgages. They have been hit hard by the U.S. housing crisis, seeing borrowing costs rise and suffering billions of dollars of losses as many investors lose confidence they can raise sufficient capital to stay afloat.
Were Fannie and Freddie unable to borrow, or find it too costly to borrow, they would not be able to buy mortgages from lenders. This would make it far more difficult and perhaps impossible for people to obtain home loans, which could cause the already hard hit housing market to grind to a halt.
"The credit crisis is getting more intense, the run-up in oil is getting more intense, and of course the potential for military conflict (with Iran) is intensifying," said Marc Pado, U.S. market strategist at Cantor Fitzgerald & Co in San Francisco
"There isn't anything out there that's good. Nobody wants to be a long holder of stocks over the weekend. For the most part people are at their most defensive levels."
(Reporting by Herbert Lash. Editing by Richard Satran)