* FTSEurofirst 300 index falls 0.5 percent
* Porsche tumbles on likely VW merger delay
* RWE slips as sees bigger drop in profit
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] By Joanne FrearsonLONDON, Feb 24 (Reuters) - European shares fell on Thursday as turmoil in Libya drove up oil prices and fuelled concern about growth, while Porsche <PSHG_p.DE> plummeted after saying its merger with Volkswagen <VOWG_p.DE> would likely be delayed.
By 1004 GMT, the pan-European FTSEurofirst 300 <
> index of top shares was down 0.5 percent at 1,146.79 points, a fourth straight session of losses this week and the fifth since the market rally ended Feb. 18."There has been another spike in oil and general unrest in the Middle East has knocked all confidence out of the market," Mark Priest, senior equities trader at ETX Capital, said.
"We cannot see a turnaround unless the situation is resolved in Libya."
Investor sentiment remained jittery after Brent crude <LCOc1> surged to its highest level since August 2008 on supply concerns, with fears this could feed through into higher inflation and hurt company margins.
Goldman Sachs said oil markets were driven by fear of political unrest spreading. The turmoil has cut more than a quarter of OPEC member Libya's crude output and there are worries unrest could spread to oil rich countries including top exporter Saudi Arabia. [
]Muammar Gaddafi has vowed to crush the revolt, but Egyptian workers had said anti-government militias were in control of the Libyan town of Zuara, about 120 km (75 miles) west of the capital. [
] [ ]Carmakers, which come under pressure when the oil price is high, featured among the worst performers, with the STOXX Europe 600 Automobiles & Parts <.SXAP> dropping 2.5 percent.
Porsche <PSHG_p.DE> fell 8.9 percent after saying its merger with Volkswagen <VOWG_p.DE> is more likely to be delayed after German prosecutors found evidence of further crimes in an investigation of former board members. [
]Volkswagen slipped 3.8 percent.
France's Vallourec <VLLP.PA> lost 5.1 percent after it said margins in the first half of the year would be held back as it predicted a strong rise in raw materials costs. [
]RWE FALLS RWE <RWEG.DE>, Europe's fifth-largest utility, fell 5.6 percent after saying it expects a bigger-than-anticipated drop in 2011 operating profit. [
]Royal Bank of Scotland <RBS.L> slipped 2.8 percent after its results included bad debts from Ireland and an uninspiring investment banking performance. [
]"The situation in Ireland has had a painful effect on the bank's numbers. Whilst in line with many of its global peers the investment banking arm has failed to inspire," Richard Hunter, head of UK Equities at Hargreaves Lansdown Stockbrokers, said.
But French bank Credit Agricole <CAGR.PA> rose 4.7 percent after it dismissed fears it would have to raise new capital to meet tougher Basel III banking rules. [
]Capita <CPI.L> gained 7.2 percent after the British outsourcing group's full-year profit rose 12 percent and it gave a positive outlook on 2011. [
]German gross domestic product (GDP) grew 0.4 percent in the fourth quarter, powered by foreign trade. [
]Across Europe, the FTSE 100 <
> index was down 0.5 percent, Germany's DAX < > lost 1 percent and France's CAC 40 < > was down 0.4 percent.(Reporting by Joanne Frearson; editing by David Hulmes)