LONDON- World oil prices fell Friday in volatile trade after major crude exporter Libya called a ceasefire with rebels, easing fears about possible damage to its energy facilities.

Brent oil dived US$3 immediately after the ceasefire announcement, compared with its level in the minutes before.

Brent North Sea crude for delivery in May recovered slightly to stand at US$113.29 a barrel in late London trade, down US$1.61 from Thursday’s close.

New York’s main contract, light sweet crude for April, was US$1.20 lower at US$100.22.

Earlier Friday and ahead of the ceasefire announcement, crude futures rose in response to the United Nations sanctioning air strikes against Libya, where popular unrest has practically halted exports of its crude to the West.

“The potential damage to the country’s oil infrastructure is obviously bullish (supportive) for oil prices,” PVM brokers analyst Tamas Varga said of Libya.

Libya responded to the UN deal by announcing Friday an immediate ceasefire in the month-long battle against rebels fighting to overthrow Moamer Kadhafi, saying it was complying with demands from the Security Council.

A coalition of Western nations geared up Friday to quickly launch air strikes against the north African country after the UN approved military action to prevent Kadhafi crushing the insurgency.

Libya was producing 1.69 million barrels a day before its recent unrest, according to the International Energy Agency, of which 1.2 million were exported, mostly to Europe.

However the IEA said this week that Libya’s oil exports would “remain off the market for a considerable time”.

Unrest in oil-producing Bahrain was also contributing to the market jitters.

Standard & Poor’s said Friday it had cut Bahrain’s long- and short-term local and foreign currency sovereign credit ratings because of mounting political unrest in the Gulf monarchy.

Bahrain’s Shiite opposition meanwhile called for fresh demonstrations after Friday prayers, in defiance of martial law and a violent crackdown by the US-backed kingdom’s security forces.

Markets were also tracking the latest developments in Japan, the world’s third biggest importer of oil and which is struggling to overcome a nuclear disaster following last week’s devastating earthquake and tsunami.

“Four per cent of Japan’s power plant capacities are offline on a sustainable basis after nuclear power plants have been shut down, meaning that Japan’s energy requirements have to be covered to a greater extent by fossil fuels such as oil, coal and gas,” Commerzbank analysts said in a research note to clients. In recent days, the price of uranium — used to generate nuclear power — has slumped by a quarter while the cost of coal and gas have soared more than 10 per cent.

“It is odd to think of Europe or Japan as potential growth markets for thermal coal. However, with nuclear power production apparently moving into reverse in these two regions, the outlook for fossil fuels such as thermal coal, in addition to natural gas and oil, appears much more promising,” Deutsche Bank analysts said.

Brent crude oil plunged almost US$6 at one stage on Tuesday, as fears grew over the potential nuclear disaster in Japan.

Analysts said this was because major radiation leaks would likely hamper reconstruction and economic activity in Japan, the world’s third biggest economy and that in turn would weigh on the country’s oil consumption.