U.S. oil prices hit their lowest in almost six and a half years on Wednesday after U.S. data showed an unexpected rise in crude stockpiles. U.S. crude stocks were up 2.6 million barrels at 456.21 million barrels last week, the U.S. Energy Information Association (EIA) said. Stocks at Cushing, Oklahoma, the delivery point for U.S. crude futures, rose 326,000 barrels to 57.44 million.