World oil prices rose on Friday amid heightened tension over the risk of terrorism.
New York's benchmark contract, light sweet crude for delivery in September, climbed BrentUS$0. 31 to US$41.67 a barrel. Brent North Sea for September advanced US$0.26 to US$38.27.
Traders appeared nervous ahead of the weekend, said AG Edwards market analyst Bill O'Grady.
"There are all kind of worries that something bad is going to happen during the Democratic convention," he said.
The FBI said on Friday it was looking into unconfirmed reports that a domestic group was planning to attack media vehicles during the Democratic Convention, which opens in Boston tomorrow and runs through to Thursday.
Concern over worldwide tensions mounted after kidnappers in Iraq seized Mohammed Mamdouh Hilmi Kotb, the third most senior official at the Egyptian embassy in Baghdad and the first diplomat taken in Iraq's wave of kidnappings.
"The Egyptian diplomat being kidnapped showed that Iraq is still a mess," O'Grady said.
Prices also were supported by a financial crisis at Russian energy giant Yukos, which warned it would declare bankruptcy if the government sold its Yuganskneftegas unit to cover a multi-billion-dollar tax bill.
"It is unclear how much of the bankruptcy talk is designed to put pressure on the Russian government," Informa Global Markets analyst Peter Luxton commented in London.
Funds were unwilling to be in short supply of oil contracts in case of supply disruptions during the weekend, he said.
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