World oil prices were mixed in Asian trade on Thursday in a market clouded by concerns over the struggling US economy and discord over a rescue plan for troubled eurozone nations.

In morning trade, New York’s main contract, light sweet crude for November delivery, was down eight cents at $86.03 a barrel, extending sharp falls in New York after a glum assessment of the US Federal Reserve.

Brent North Sea crude for December was up 21 cents to $108.60 after reports of renewed threats to oil production in Libya from forces loyal to ousted leader Muammar Gaddafi.

Analysts said the overall mood was being dictated by economic worries, with investors waiting for results of a summit by European leaders this weekend on how to prevent the debt crisis from further escalating.

Initially limited to Greece, Europe’s almost two-year-old debt crisis has spilled across borders, threatening large economies as well as the continent’s banks.

“Markets will look to this weekend’s European economic summit for some signs that a workable plan can be crafted to reduce the market stress,” said Mr Sanjeev Gupta, head of the Asia-Pacific Oil & Gas practice at Ernst & Young.

Capital Economics business consultancy said it expects growth to be “very low or negative in most advanced economies” next year.

“The eurozone is already heading for recession, and if its public debt and banking crisis is not contained, the rest of the developed world may follow suit,” it warned in a market commentary.