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The oil markets reacted nervously to the arrival of another category 4 hurricane in the Gulf of Mexico – home to most of the US’ oil refineries – just weeks after the devastation of Hurricane Katrina. Spot Brent climbed to $64.20 a barrel in London on 21 September, up from $63.57 a week earlier, as television pictures showed Hurricane Rita smashing its way through the Florida Keys and across the Gulf. US light sweet crude prices climbed to $67.30 a barrel.