Oil prices were mixed on Tuesday as the API reported an increase in U.S. stockpiles at 2.9 billion barrels, well above market expectations, but U.S. sanctions on Iran's oil exports triggered global supply concerns. Front-month U.S. crude futures fell 0.26 percent at $72.08 a barrel. Front-month Brent crude futures rose 0.14 percent, at $81.50 a barrel. The spread between the two benchmarks stood at $9.42 a barrel.

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