* Crude prices at 30-month highs on fear unrest may spread
* Global stocks fall as oil concerns prompt growth worries
* Dollar, Swiss franc gain as tensions in Libya escalate
* Government debt prices gain on safe-haven buying (Adds fresh prices, news on Libya, quotes)
By Herbert Lash
NEW YORK, Feb 22 (Reuters) - World stocks fell on Tuesday as a growing revolt in Libya drove oil prices to 30-month highs, prompting fears the unrest could spread to other major oil suppliers in the region and disrupt global growth.
Crude prices surged in New York and London, where prices for North Sea Brent <LCOc1> touched $108.57 a barrel before paring some gains, as concerns about oil supplies cooled the appetite for assets perceived as risky. For details see: [
]In Libya, rebel soldiers said the eastern region of the country had broken free from Muammar Gaddafi, who witnesses said was using tanks, warplanes and mercenaries to fight a growing uprising against his rule. [
]Sporadic blasts could be heard in the eastern city of Tobruk, a Reuters correspondent there said, the latest sign that Gaddafi's 41-year grip on the oil- and gas-exporting nation was weakening.
Libya only ranks third in Africa after Nigeria and Angola in oil production, but investors are concerned about the potential spread of violence in North Africa and the Middle East, and how that might disrupt the region's oil supply.
"Continued trouble in the Middle East dominates market movement. Escalating concerns in Libya and a violent crackdown on demonstrations in Bahrain pushed the equity markets lower in Europe and bonds higher," said John Shin, FX strategist at Bank of America Merrill Lynch in New York.
Global stocks, as measured by MSCI's all-country world index <.MIWD00000PUS>, pared some losses and were down 0.7 percent, and Wall Street also pared some of its early losses.
The Dow Jones industrial average <
> was down 53.96 points, or 0.44 percent, at 12,337.29. The Standard & Poor's 500 Index <.SPX> was down 9.69 points, or 0.72 percent, at 1,333.32. The Nasdaq Composite Index < > was down 31.47 points, or 1.11 percent, at 2,802.48.The euro rose versus the dollar as hawkish comments from a European Central Bank official helped it pare earlier steep losses as escalating tensions in Libya prompted investors to seek safer assets. [
]The euro <EUR=> was up 0.15 percent at $1.3695, and against the Japanese yen, the dollar <JPY=> was down 0.07 percent at 83.05.
U.S. crude prices jumped, in part because electronic trading of the contract occurred on Monday, but there was no settlement close as the exchange in New York was closed for the Presidents Day holiday.
U.S. light sweet crude oil <CLc1> rose $4.57 to $90.77 a barrel.
Shorter-dated German bond yields rose to their highest in about two weeks, and U.S. Treasury prices also gained. [
]The benchmark 10-year U.S. Treasury note <US10YT=RR> was up 19/32 in price to yield 3.51 percent.
Gold prices slipped but remained above $1,400 an ounce as the dollar surrendered its earlier 1 percent gains versus the euro, with violence in Libya fueling interest in the metal as a haven from risk. [
]Spot gold prices <XAU=> fell $4.57 to $1,401.00 an ounce. (Additional reporting by Claire Milhench, Tricia Wright, Brian Gorman, Marius Zaharia, Rebekah Curtis, Jan Harvey and Amanda Cooper Jessica Mortimer in London; Writing by Herbert Lash, Editing by Chizu Nomiyama)