LONDON: Oil prices slipped on Thursday as officials from the big global powers remained locked in nuclear talks with Iran that, if successful, could allow the Islamic state to release more crude oil onto world markets.
Negotiations on Tehran's disputed nuclear programme have stretched well beyond a self-imposed March 31 deadline, with diplomats saying the chances of a preliminary accord in the next few hours are finely balanced.
Tehran is hoping for a deal that will end crippling economic sanctions and allow it to sell millions of barrels of oil, some of it stored at sea in supertankers and ready for delivery.
Brent crude for May was down 30 cents at $56.80 a barrel by 0800 GMT. The contract settled $1.99 higher on Wednesday.
U.S. crude for May was down 25 cents at $49.84 a barrel, after closing up $2.49, or 5.2 percent, on Wednesday.
Most financial markets will be closed on Friday for public and religious holidays.
Crude prices snapped a three-session losing streak on Wednesday after the U.S. Energy Information Administration (EIA) said U.S. oil production dropped last week for the first time since late-December.
In the Swiss city of Lausanne, U.S. Secretary of State John Kerry and German Foreign Minister Frank-Walter Steinmeier said they would stay on in an effort to seal a political agreement with Iran, a step towards a final pact due by the end of June.
Iranian Foreign Minister Mohammad Javad Zarif said "significant progress" had been made but more discussions were needed to reach a deal on how to resolve a 12-year standoff over Tehran's nuclear ambitions.
Many analysts doubt a deal can be clinched in Lausanne.
"(I expect) nothing beyond a general statement of intentions to keep talks going through spring," Scott Lucas of EA WorldView, a specialist website on Iran and Syria, told Reuters Global Oil Forum.
Despite the data showing U.S. production falling, U.S. crude oil inventories climbed last week to a record high for the 12th straight week.
The EIA said U.S. crude stocks rose 4.8 million barrels to 471.4 million barrels in the week to March 27.
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