World oil prices reversed earlier gains on Friday as the market switched its focus back to healthy US crude stockpiles, and away from global supply concerns linked to Iran and Nigeria.
New York's main contract, light sweet crude for delivery in April, shed 42 cents to $60.05 a barrel. In London, the price of Brent North Sea crude for April delivery slid 31 cents to $60.75.
Earlier, crude futures had risen as traders tracked events in Iran on fears that the country could cut its crude exports if hit by economic sanctions over its nuclear programme.
Oil prices had rebounded by more than a dollar in London on Thursday, one day after plunging on news of ample US energy supplies and an OPEC decision to keep pumping oil at a near 25-year high.
