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* Markets unconvinced by Greece debt bailout
* Euro drops to 14-month low, losing over 1 percent vs USD
* Government bonds surge, German bund yields at record low
By Daniel Bases
NEW YORK, May 5 (Reuters) - Fears of contagion from the Greek debt crisis knocked the euro to a 14-month low and sent world stocks reeling as violent protests erupted over Athens' austerity measures and Moody's warned Portugal's debt could be downgraded.
U.S. and German bonds surged on investor fears that a massive aid package would not be enough to ensure other fiscally weak euro-zone nations don't spiral down.
The euro tumbled 1 percent to $1.2850 <EUR=>, its lowest point since mid-March 2009 and steepest one-day loss since June of last year. It is down roughly 3.5 percent against the greenback this week.
Skepticism that Greece can deliver on its promises of tough austerity measures dominated the markets.
"European contagion is really the name of the game. That's all we're watching," said Rick Klingman, managing director of Treasury trading at BNP Paribas in New York.
German bund yields hit a record low, while the cost of protecting Portuguese government debt against default hit a record high after credit rating agency Moody's Investors Service said Portugal was on review for a possible downgrade.
U.S. stocks were weaker on the contagion fear, taking little notice of a private sector report showing gains in the U.S. labor market for the first time since January 2008. [
]In mid-morning trade, the Dow Jones industrial average <
> fell 26.00 points, or 0.24 percent, at 10,900.77. The Standard & Poor's 500 Index <.SPX> lost 4.23 points, or 0.36 percent, at 1,169.37. The Nasdaq Composite Index < > dropped 18.69 points, or 0.77 percent, at 2,405.56.The FTSEurofirst 300 <
> index of leading European shares pared losses slightly on strong results from market bellwethers like Societe Generale <SOGN.PA>. The index however closed down 0.8 percent, near a nine-week low.In Athens, striking public sector workers challenged Greece's bailout-for-austerity deal. Three people were killed when protesters set a central Athens bank ablaze. [
]Policymakers, including International Monetary Fund chief Dominique Strauss-Kahn and the European Central Bank's Axel Weber, warned of the dangers of contagion to other high-debt euro zone nations. [
]Portuguese credit default swap (CDS) prices surged to 407 basis points from 344 basis points, according to CDS monitor CMA DataVision. The firm said the levels implied a default rate of 29.6 percent.
Greece's CDS levels reached a record high of 850 basis points from 764.5 basis points at the New York close on Tuesday.
The two-year Schatz yield <EU2YT=RR> was spurred to a fresh record low of 0.569 percent. The Schatz, a short-dated euro zone government bond benchmark, was introduced in the early 1970s.
The 10-year Portuguese/German government bond yield spread <PT10YT=TWEB><DE10YT=TWEB> widened to 310 basis points, a euro lifetime gap.
The equivalent Spanish spread <ES10YT=TWEB> widened to 136 bps, also a euro lifetime gap.
The price on benchmark 10-year Treasury notes <US10YT=RR> was up 22/32 for a yield of 3.51 percent, down from 3.60 percent late Tuesday and the lowest intraday level since early February.
World stocks as measured by MSCI <.MIWD00000PUS> fell 1.1 percent to their lowest since early March, while the more volatile emerging equities index <.MSCIEF> dropped 2 percent.
Asian markets also weakened. Shanghai's key index <
> slid as much as 2 percent to its lowest in seven months, suffering from Beijing's weekend moves to tighten policy.Japan's markets have been closed this week, and are scheduled to reopen on Thursday.
Oil extended losses, falling $2.10, or 2.6 percent, to $80.64 per barrel, a day after its steepest one-day percentage loss in three months, on rising inventories and a firm dollar. [
]Spot gold <XAU=> rose $1.50 to $1,172.60 an ounce despite strength in the greenback. (Additional reporting by Emily Flitter in New York, Carolyn Cohn and Neal Armstrong in London; editing by Jeffrey Benkoe)