* Global stocks slump on concerns about economic recovery
* Oil falls sharply as Europe debt worries fester
* Bonds rally on flight to safety on U.S. data (Updates with fresh prices, comment)
By Herbert Lash
NEW YORK, May 20 (Reuters) - Global stocks and commodities sold off on Thursday, knocking U.S. stocks down 10 percent from this year's highs in April, on worries that fiscal tightening is on the rise and will snuff the world's nascent recovery.
U.S. oil prices suffered their biggest one-day loss in 13 months while U.S. government debt prices soared as investors sold liquid assets and snapped up safe-havens such as bonds.
The 10 percent slide in the benchmark Standard & Poor's 500 Index from April highs is the most significant break in the rally off of 12-year lows that stocks fell to in March 2009.
The sell-off initially was driven by fear that Europe's debt crisis would hobble economic growth and then accelerated on signs that governments need to rein in deficit spending.
Fiscal tightening in debt-strapped developed countries will slow growth and lower inflation across the world, which is increasing selling pressure in financial markets, said Bill Gross, co-chief investment officer at Pimco. [
]Gross told Reuters that financial markets are exhibiting "a mini-relapse of a flight to liquidity as hedge funds and other leveraged positions are liquidated to preserve capital."
The International Monetary Fund on Wednesday pressed Japan to begin a "credible" fiscal program which includes a 5 percent sales tax increase. French President Nicolas Sarkozy proposed deficit "targets" for France.
The belt-tightening sparked investors' fears while an unexpected jump in new U.S. jobless claims underscored the apprehension. Volatility reigned as a sense of instability unleashed panicky selling across markets.
"Uncertainty has people stampeding for the exits," said Chris Rupkey, chief financial economist at Bank of Tokyo/Mitsubishi UFJ in New York.
Shortly before 3 p.m., the Dow Jones industrial average <
> was down 189.62 points, or 1.82 percent, at 10,254.75. The Standard & Poor's 500 Index <.SPX> was down 21.76 points, or 1.95 percent, at 1,093.29. The Nasdaq Composite Index < > was down 49.85 points, or 2.17 percent, at 2,248.52.Fears that other euro zone countries will follow Germany's move on Tuesday to ban short selling in some stocks and bonds helped propel a widespread aversion to risk.
Germany said restoring confidence in the euro was its "top priority," while a Federal Reserve official said Europe's debt crisis poses a "potentially serious" risk to the U.S. recovery as it threatens global credit markets and commerce. [
] [ ]The dollar was down against a basket of major currencies, with the U.S. Dollar Index <.DXY> down 1.08 percent at 85.456.
The euro <EUR=> was up 1.28 percent at $1.2586, and against the yen, the dollar <JPY=> was down 1.47 percent at 90.28.
Market volatility was high. Traders pointed to purchases of 10-year Treasury notes by an Asian buyer and to a huge seller of e-minis, a futures contract providing holders exposure to the benchmark Standard & Poor's 500 Index <.SPX>.
The Chicago Board Options Exchange Volatility index <.VIX>, often referred to as Wall Street's fear gauge, rose as much as 28 percent to its highest since April 2009. [
]The benchmark 10-year U.S. Treasury note <US10YT=RR> was up 25/32 in price to yield 3.28 percent.
The Reuters-Jefferies CRB index <.CRB>, a global benchmark for commodities, at one point slumped to 8-1/2 month lows.
An apparent lack of unity among euro-zone leaders on tackling debt problems triggered U.S. worries about additional regulation.
"One of the problems is the European policy makers have done a very poor job handling this whole crisis ... and the poor response has further undermined investor confidence," said Mike O'Rourke, chief market strategist at BTIG LLC in New York.
U.S. light sweet crude oil <CLc1> fell $1.86 to $68.28 a barrel.
The expiring June contract for oil on the New York Mercantile Exchange <CLMO> tumbled more than 8 percent to a nine-month low as remaining open interests were either rolled to July or sold, in an effort to avoid physical delivery.
The contract has fallen 26 percent since hitting a 19-month high of $87.15 on May 3.
"Oil prices are sliding on liquidations ahead of the June contract's expiration and as we have a glut of oil in the Cushing, Oklahoma, delivery point," said Phil Flynn, analyst at PFGBest Research in Chicago.
Spot gold prices <XAU=> fell $5.45 to $1185.30 an ounce.
Worries over the euro zone hammered Asian stocks, driving MSCI's index of Asia-Pacific shares outside of Japan <.MIAPJ0000PUS> down 2.4 percent to an eight-month low.
Japan's Nikkei average <
> closed at a new three-month low despite data that showed Japan's economy grew 1.2 percent in the first quarter, outpacing its euro zone and U.S. peers. [ ] (Reporting by Nick Olivari and Ellen Freilich in New York and Emma Farge, Ian Chua and William James in London; Writing by Herbert Lash; Editing by Chizu Nomiyama)