LONDON (AFP) - Oil prices rose Thursday, supported by a tighter supply situation in the US, analysts said. New York's main contract, light sweet crude crude for delivery in Nov, climbed 33 cents at $86.44. Brent North Sea crude for Dec gained 63 cents to $109.02 in London midday deals. "One reason (for the rises) is likely to be US inventory data, published by the US Dept of Energy yesterday, indicating that US crude oil stocks fell last week by 4.73m barrels to their lowest level since Feb 2010.