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Anti-Gadhafi rebels drive a vehicle forward as smoke rises following an air strike by pro-Libyan leader Moammar Gadhafi warplanes that attacked a highway leading to the town of Ras Lanouf, eastern Libya, Tuesday, March 8, 2011. Libyan warplanes launched at least three new airstrikes Tuesday near rebel positions in the oil port of Ras Lanouf, keeping up a counteroffensive to prevent the opposition from advancing toward leader Moammar Gadhafi's stronghold in the capital Tripoli.Hussein Malla

Brent oil prices rebounded towards $116 (U.S.) a barrel on Wednesday as intense fighting in Libya stoked more supply worries and U.S. crude fell as inventories rose sharply, widening Brent's premium against U.S. crude.

Brent crude for April delivery settled $2.88 higher at $115.94 a barrel, having earlier hit $116.18.

U.S. April crude closed at $104.38 a barrel, down 64 cents, after hitting an early high of $105.92.

Brent crude's premium over U.S. benchmark West Texas Intermediate crude widened to $11.56, from $8.04 at the close on Tuesday. That was a gain of $3.52, or 44 per cent, the biggest single-day percentage gain of Brent over U.S. crude since Nov. 15.

Muammar Gadhafi's forces struck an oil pipeline leading to the town of Es Sider and dropped bombs on storage tanks in the Ras Lanuf oil terminal area in the eastern section of Libya that is rebel-controlled.

Libyan state television blamed the explosions on "al-Qaeda-backed" armed elements.

Rebels said they had retaken the main square of the western city of Zawiyah after pro-Gadhafi forces took control of it earlier in the day. The fighting has led to the closure of one of Libya's biggest refineries there.


U.S. crude prices weakened after data from the U.S. Energy Information Administration showed crude inventories rose 2.51 million barrels last week, dwarfing the forecast for an increase of just 400,000 barrels in a Reuters poll.

More telling for U.S. crude, crude stocks at the key delivery hub in Cushing, Oklahoma, soared 1.69 million barrels to a record 40.26 million barrels.

But losses for U.S. crude were limited as the weekly data showed drawdowns for gasoline and distillate inventories were bigger than expected, reflecting improving demand.

U.S. gasoline for April jumped more than 8 cents to close at $3.0272 a gallon, while April heating oil gained nearly 6 cents to $3.0707 a gallon, both near 2-1/2-year highs.


Perception of prolonged trouble in Libya was driving the rally in oil prices, said Christopher Bellew, an oil trader at Bache Commodities in London.

"As the outlook for Western intervention looks less likely -- which would bring things to a quick conclusion -- then we are looking at a prolonged struggle," he said.

Confirming previous non-Libyan estimates, Shokri Ghanem, chairman of Libya's National Oil Corp, told a news conference in Tripoli that production has been cut to about half a million barrels per day, from 1.6 million bpd, as many foreign and local workers have left oil fields.

Libyan oil trade has been paralyzed as banks decline to clear payments in dollars due to U.S. sanctions, though Austrian energy group OMV said it had been buying small amounts of Libyan crude oil and would continue to do so.

NATO Secretary-General Anders Fogh Rasmussen said the alliance was not looking to intervene in Libya, but its military was ready to respond at short notice.

Oil prices fell on Tuesday after Kuwait's oil minister said OPEC was considering raising output due to the Libyan outage.

But an OPEC delegate said on Wednesday that the group saw no need for an emergency meeting to discuss raising output.

Leading OPEC producer Saudi Arabia is already pumping more oil -- up to 9 million barrels per day -- to keep supplies available if needed.

Saudi Shi'ites staged another small protest in the kingdom's Eastern province, defying a ban on demonstrations, but Foreign Minister Prince Saud al-Faisal said dialogue, not protest, was the best way to bring about change.

OPEC member Algeria's oil minister said on Wednesday he was confident that potential domestic unrest in Algeria or Saudi Arabia would not disrupt oil exports.