* Euro falters further on Moody's Ireland credit cut
* U.S. Treasuries find interest as euro debt tumbles
* European banks take a hit, weigh on stock markets (Updates with European markets' close)
By Alina Selyukh
NEW YORK, Dec 17 (Reuters) - The euro extended losses against the dollar and global stocks dropped on Friday, weighed by renewed concerns over euro zone debt after a multi-notch downgrade of Ireland's credit rating.
After Moody's slashed Ireland's rating by five notches and warned further downgrades could follow [
], investors curbed their appetite for risk-taking and edged back into U.S. Treasuries and German bunds.Moody's move on Ireland followed Fitch's downgrade last week cutting Ireland's credit level by three notches. Earlier this week, Moody's placed Spain and Greece on a review for possible downgrades.
"While the Moody's downgrade of Ireland isn't any surprise, the sheer magnitude of five notches warrants a mention. We haven't seen anything like this since the Asian crisis," said Win Thin, senior currency strategist at Brown Brothers Harriman in New York.
"We foresee ongoing downgrades for peripheral -- and perhaps even some core -- euro zone countries over the course of 2011 as the debt ratios are going to get much worse before they get better," Thin added.
World markets gained little comfort from a European Union summit, at which leaders agreed to create a permanent financial safety net from 2013 but provided no new measures to deal with the immediate crisis.
"Everyone should be troubled with the situation in Europe, and we don't think this the last of the news," said Matt King, chief investment officer at Bell Investment Advisors in Oakland, California, which oversees $400 million in assets.
European banks were under severe selling pressure over Ireland's debt situation.
In midday New York trade, U.S.-listed shares of Allied Irish Bank <AIB.N> fell 5.4 percent to $1.22 while Barclays <BCS.N> dropped 2.2 percent to $16.23. [
]The pan-European top shares index, FTSEurofirst 300 <
>, closed down 0.46 percent, at 1126.14, dragged by banks <.FTNMX8350>, which were down 1.49 percent. As one example, shares of Royal Bank of Scotland <RBS.L> were down 5.73 percent.The Dow Jones industrial average <
> shed 24.07 points, or 0.21 percent, to 11,475.18, and the Standard & Poor's 500 Index <.SPX> edged down 0.51 points, or 0.04 percent, to 1,242.36. In contrast, the Nasdaq Composite Index < > saw a boost from technology companies, gaining 8.04 points, or 0.30 percent, to 2,645.35.Global markets reflected by the MSCI's all-country world stock index <.MIWD00000PUS> dipped 0.17 percent, while the Thomson Reuters global stock index <.TRXFLDGLPU> fell 0.28 percent.
EURO PRESSURES MARKETS
The euro sank against the dollar, hitting a two-week low after a drop below $1.32 triggered automatic sell orders.
After a blip of positive news from better-than-expected data on German business morale, the euro slid as low as $1.3138 on trading platform EBS <EUR=EBS>, and was last down <EUR=> 0.63 percent at $1.3153.
Bolstered by the weak euro, the dollar <.DXY> rose against a basket of major currencies by 0.43 percent to 80.523. Against the Japanese yen, the dollar <JPY=> strengthened 0.11 percent to 84.13.
With the dollar on stronger ground, gold and oil prices slipped. In midday trade, crude oil <CLc1> rose 40 cents, or 0.46 percent, to $88.10 per barrel, and spot gold prices <XAU=> climbing 0.15 percent, to $1371.40.
As investors sought security in the tumultuous market, U.S. Treasury securities rallied. The benchmark 10-year U.S. Treasury note <US10YT=RR> was up 12/32 points in price, yielding 3.3879 percent.
Over the last two weeks, Treasuries have been underselling on concerns of ballooning deficits, stemming from the extension of the Bush-tax cut plan. Late Thursday, the U.S. House of Representatives passed the deal between U.S. President Barack Obama and Republican leaders to extend expiring tax cuts. The measure now goes to Obama to sign into law.
Even so, Treasuries attracted interest in the wake of renewed euro zone debt concerns. "There is a risk that the sovereign crisis will spread across the Atlantic to the U.S. ... There's already evidence that it's turning to disorderly unwinding," said David Woo, head of global rates and currencies at Bank of America-Merrill Lynch.
High up on investors' radar is Ireland, whose debt levels have quadrupled since late 2007 on the back of a banking sector meltdown.
Irish 10-year government bond yields <IE10YT=TWEB> were 24.1 basis points higher on the day at 8.682 percent, pushing the yield spread over German bunds 23 bps wider to 565 bps.
The spread was off its widest levels of the day around 575 bps, with traders citing some small buying from the European Central Bank, although liquidity was very thin.
Equivalent Portuguese and Spanish spreads also edged wider as the threat of further credit downgrades in the near future rattled those investors still active in the market.
(Additional reporting by Emelia Sithole-Matarise, Dominic Lau, Emily Flitter, Natsuko Waki, Brian Gorman and William James in London, and Angela Moon, Ryan Vlastelica and Wanfeng Zhou in New York, Editing by Chizu Nomiyama)