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New York's main contract, West Texas Intermediate light sweet crude for delivery in July, dropped 58 cents to $93.70 a barrel in the morning and Brent North Sea crude for July delivery shed 47 cents to $102.13.
"Oil prices are being kept down after the US dollar strengthened," Ric Spooner, chief market analyst at CMC Markets in Sydney, told AFP.
A stronger greenback makes dollar-priced oil more expensive for buyers using weaker currencies. In turn, that tends to weigh on oil demand and prices.
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Under questioning before the Joint Economic Committee in Congress on Wednesday, Federal Reserve chairman Ben Bernanke acknowledged the Fed could decide to begin reducing its massive bond purchases in its next few meetings.
But he said any tapering off could only happen once it had confidence that economic gains could be sustained, warning that a "premature tightening of mo