World oil prices rose for the fourth day in a row as the market kept its focus on developments concerning Iran and Nigeria. Crude futures had soared yesterday as traders set aside news of healthy US energy stocks to concentrate on global supply concerns. New York's main contract, light sweet crude for delivery in April, added 32 cents to 63.68 usd per barrel in electronic deals today. The contract had leapt 1.39 usd the previous day. In London, the price of Brent North Sea crude for April delivery gained cents to 64.45 usd per barrel, after surging 1.62 usd yesterday. "The possibility is high that Iran will be sent to the UN Security Council by the IAEA and this increases the risk of a supply disruption from Iran which is bullish for prices," said Dariusz Kowalczyk, a Hong Kong-based senior strategist with CFC Seymour. Iran and three European Union powers failed in 11th-hour talks on Friday to reach an agreement to allay fears over Iran's suspect nuclear program, French Foreign Minister Philippe Douste-Blazy said. "Unfortunately, we could not obtain an agreement with (Iranian top nuclear negotiator Ali) Larijani," the French minister said after emerging from the discussions in Vienna. The talks come ahead of a crunch meeting March 6 of United Nations' nuclear watchdog, the International Atomic Energy Agency, which is to make an assessment of Iran's nuclear program that will be sent to the UN Security Council, which could then take punitive action. Iran, the second-biggest producer in OPEC after Saudi Arabia, is accused by Western powers of seeking nuclear weapons under cover of a civilian energy program. In Nigeria, lingering supply concerns provided further support for oil prices. The market was meanwhile looking ahead to an OPEC production meeting in Vienna next Wednesday, dealers said. Most expect the Organisation of Petroleum Exporting Countries to maintain current output levels.