LONDON (AP) -- Oil prices briefly rose above US$60 a barrel Friday for the first time since early January, lifted by tension between Iran and the U.S., violence in Nigeria and frigid U.S. temperatures.
Light, sweet crude for March delivery rose 13 cents to US$59.84 in electronic trading on the New York Mercantile Exchange by Friday afternoon London time.
Oil prices have risen steadily over the last two weeks on news of bitter winter weather in the U.S., the world's biggest oil consumer. On Thursday, the contract jumped US$2 to settle at US$59.71 a barrel -- the highest settlement price since Dec. 29.
Before Friday, crude oil had not traded above US$60 a barrel on the Nymex since Jan. 3, the first trading day of the year.
Tetsu Emori, chief commodities strategist at Mitsui Bussan Futures in Tokyo, thought the price increase was an overreaction.
"The surge is quite hard to understand. It seems traders are looking at the short term -- heating oil demand and geopolitical tensions -- when they should be looking at the medium and long term," Emori said.
"We have to remember that the geopolitical risks, especially in relation to Iran, have not really been realized in terms of affecting supply, and that the winter season will be over in a month," he said.
The Brent crude contract for March fell 11 cents to US$58.92 a barrel on the London ICE Futures exchange.
On Thursday, Iran stepped up its warnings to the United States, which rekindled worries that supplies out of the oil producer could be hindered. Iranian supreme leader Ayatollah Ali Khamenei said Tehran would strike U.S. interests around the world if his country is attacked.
Though the comments didn't immediately cause a spike in prices, it kept prices from falling, as did ongoing forecasts of cold weather throughout the United States, and news of a shutdown at an Occidental Petroleum Corp. crude and natural gas field in California.
The market was also watching violence in Nigeria, where a Frenchman was kidnapped Thursday in the latest of a spate of violence targeting oil workers.
More than 100 foreigners have been seized in a year of stepped-up attacks across Nigeria's southern region, where the crude is pumped. More than 40 have been seized in the past month alone. The violence in Africa's biggest oil producer has cut daily output by nearly a quarter.
In other Nymex trading, natural gas was down 2 cents to US$7.851 per 1,000 cubic feet. On Thursday it settled at US$7.871, its highest settlement price of the year. Natural gas, the more popular form of home heating in the United States, has risen more than 60 percent over the past month on the recent cold weather. It is trading around the same level it was this time last year.
Heating oil rose 0.16 cents to US$1.7266 a gallon.
The National Oceanic and Atmospheric Administration continues to forecast normal to below-normal temperatures across the United States until at least Feb. 22.