* FTSEurofirst 300 index down 2.8 percent
* Banks, commods knocked by euro zone debt concerns
* Korea geopolitical tension nervousness
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By Joanne Frearson
LONDON, May 25 (Reuters) - European shares fell sharply on Tuesday to their lowest in nearly nine months, with banking and commodity shares hammered on fears the euro zone debt crisis could be spreading and global growth could slow.
Nervousness in the market was exacerbated by heightened geopolitical tensions in Korea after the North Korean leader Kim Jong-il ordered his military to be on a combat footing.
By 0903 GMT, the pan-European FTSEurofirst 300 <
> index was down 2.8 percent at 946.18 points after hitting a low of 944.06 earlier, its lowest since early September 2009.The index has lost 14.4 percent since fears over the euro zone's sovereign debt problems and new fiscal austerity measures escalated in mid-April.
The yield on 10-year German government bonds sank to a record low while Bund futures extended gains to reach a record high, as risk averse investors sought safe asset classes.
Meanwhile, 10-year U.S. Treasury yields fell to a one-year low of 3.082 percent <US10YT=RR>.
"Bunds are gaining as equities, particularly banking stocks, come in for a hammering," said a trader in London.
Banks were the worst performers, with the STOXX Europe 600 Banking index <.SX7P> falling 3.6 percent.
Banco Santander <SAN.MC> and BBVA <BBVA.MC>, hit by Saturday's bailout of small savings bank CajaSur by the Bank of Spain in the previous session, continued their falls and lost 4.4 percent and 4.8 percent respectively.
Among other banks, Barclays <BARC.L>, HSBC <HSBA.L> and UniCredit <CRDI.MI> dropped 2 to 5 percent.
The banking index has lost 16 percent so far this year, the worst performing sector in Europe in 2010. Despite last year's sharp recovery, the sector is still down 66 percent from its peak of April 2007 before the financial crisis started to weigh on the market.
"The markets are sensitive to the slightest catalyst (CajaSur). Maybe it is an indication of the extent of the problems out there," said Mike Lenhoff, chief strategist at Brewin Dolphin.
"Maybe the government is going to have to involve itself in more bailouts and the thinking is this debt crisis does not have an immediate resolution."
Meanwhile, the U.S. two-year swap spreads pushed out to their widest levels in 13 months, with traders expecting benchmark dollar LIBOR to keep ratcheting higher as the euro zone debt crisis makes bank wary of lending to European institutions.
"There is a fear that there are more worrying banking cases out there. Libor has been rising significantly telling us some banks could be in trouble," said Justin Urquhart Stewart, director at Seven Investment Management.
ENERGY STOCKS WEIGH
Energy stocks were also hard hit by the concerns in the euro zone, with crude <CLc1> extending its drop to under $68 a barrel. BP <BP.L>, BG Group <BG.L>, Royal Dutch Shell <RDSa.L> and Total <TOTF.PA> fell 2.5 to 3.8 percent.
The six-week strong sell-off in shares triggered by the euro zone debt crisis has pulled European stock valuations to their lowest level in 10 months.
Shares in the STOXX Europe 600 <
> benchmark index currently trade at 12.37 times reported earnings, a level not seen since July 2009. This compares with an average price-to-earnings (P/E) ratio of 15.74 for U.S. S&P 500 <.SPX>.Across Europe, the FTSE 100 <
> index was down 2.3 percent, Germany's DAX < > fell 2.5 percent and France's CAC 40 < > was 2.8 percent lower.Spain's IBEX <
> lost 3.5 percent, Portugal's PSI 20 < > fell 2.5 percent and Italy's benchmark <.FTMIB> was down 3.4 percent. (Additional reporting by Blaise Robinson; Editing by Mike Nesbit)