* Top-300 index falls 2.6 pct; lowest close since June 2005
* Banks slide on fears linked to U.S. home financing groups
* Energy only sector to gain as oil price hits $147
By Peter Starck
FRANKFURT, July 11 (Reuters) - European shares fell sharply on Friday to end at their lowest level in more than three years as banks tumbled on fears linked to U.S. home financing groups Fannie Mae <FNM.N> and Freddie Mac <FRE.N>.
Energy <.SXEP> was the only sector in Europe to finish in positive territory, led by heavyweights oil groups Total <TOTF.PA> and Royal Dutch Shell <RDSa.L> on a spike in the price of crude <CLc1> to over $147 a barrel amid growing worries of threats to supplies from Iran and elsewhere.
The FTSEurofirst 300 index <
> of top European shares dropped 2.6 percent to 1,126.39 points -- its lowest close since June 9, 2005 and down more than 25 percent so far this year."The market has been beaten to its knees and the downturn will probably continue," said Christian Schmidt, analyst at German bank Helaba.
At one stage on Friday Europe's benchmark stock index rose as much as 0.8 percent, led by energy stocks and banks. The latter rallied initially on reports of a potential U.S. government bailout of Fannie Mae and Freddie Mac.
Sentiment quickly turned sour, however, and the DJ Stoxx European bank index <.SX7P> ended more than 4 percent lower.
"The fact that the matter (a bailout of Fannie Mae and Freddie Mac) is being debated could also indicate that a new wave of the financial crisis -- the fourth -- is on its way," Commerzbank said in a research note.
"Given their size, if these agencies get into difficulties, there are serious implications for the whole financial market," Commerzbank said, noting that the two account for some 42 percent of all outstanding U.S. mortgages.
U.S. Treasury Secretary Henry Paulson said the primary focus was supporting Fannie Mae and Freddie Mac "in their current form", remarks which analysts took as a hint that the U.S. government may not swiftly step in to help.
The U.S. S&P 500 financials index <.GSPF> was down more than 4 percent as Europe's stock markets closed. Shares in both Fannie Mae and Freddie Mac fell by around 25 percent.
"The catalyst to the recovery is surely the banking system. When the banks are in a position to finally quantify their losses and confirm their balance sheets have been shored up with fresh capital, then and only then will the recovery commence," said David Buik, strategist at BGC Partners in London.
"That could be at least a year away," he added.
HARD TO MAKE MONEY
Martin Wirth, fund manager at German equities-focused Frankfurt Performance Management, was also pessimistic.
"With the mediocre newsflow, the high stresses in the financial system and the downward swing in momentum, a quick return to a bull market is less than likely," he said.
"It will be very difficult to make money in the coming weeks," Wirth added.
Financial sector losses in Europe were led by Credit Agricole <CAGR.PA>, down close to 10 percent, after newspaper Le Monde reported that the French bank's chief executive and chairman could resign over losses tied to the credit crunch.
Royal Bank of Scotland (RBS) <RBS.L> fell 8.6 percent after Zurich Financial <ZURN.VX> pulled out of the bidding for RBS's insurance unit. The Swiss company's stock rose 4.2 percent.
Other financials losing ground included France's Societe Generale <SOGN.PA>, down 7 percent, Britain's Barclays <BARC.L> and Lloyds TSB <LLOY.L>, both down almost 6 percent, as well as France's AXA <AXAF.PA> and Switzerland's UBS <UBSN.VX>, which shed more than 5 percent each.
"With the sharp fall in equity markets in recent weeks, lower interest rate volatility and the impact of rising short rates on yield curve trades, we expect the outlook for trading revenues to remain challenging," Credit Suisse said in a research note on European wholesale banks.
Vodafone <VOD.L> was another notable loser, down 4.7 percent, after tax experts and a source familiar with the situation said the mobile phone group's potential tax bill in India could double to $4 billion if it loses a court case.
The rise in crude underpinned oil and gas companies, with Total up 0.7 percent and Royal Dutch Shell 0.2 percent firmer.
But CMC Markets warned in a note: "Any cheer here will be shortlived if Israel graduate from the sabre rattling that we're seeing right now to physical action against Iran, as any disruption in oil supply would presumably see investors running for cover across the board, regardless of how high speculators see fit to push the price of crude."
An Israeli military spokesman said media reports about Israeli warplanes secretly training in U.S.-controlled Iraq for possible attacks on neighbouring Iran were "utterly baseless." (Additional reporting by Rebekah Curtis and Patrizia Kokot in London; Editing by Erica Billingham)