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New York oil prices lower
Oil prices fell in New York on Tuesday amid expectations of another spike in weekly crude stockpile numbers as the winter weather eases across the United States.
New York's main contract, West Texas Intermediate (WTI) for delivery in April, fell $1.09 to $100.03 a barrel, its lowest level in a month.
In London, Brent North Sea crude for April added 47 cents from Monday's close to stand at $108.55 a barrel.
Ongoing tensions over Ukraine and the ouster of Libya's Prime Minister Ali Zeidan over a rogue oil tanker, putting into question the country's ability to keep exports going, helped Brent to gains.
A North Korean-flagged tanker carrying an "illegal" cargo of oil from a rebel-held terminal in eastern Libya escaped warships that were escorting it to port on Tuesday.
"Libya continues to support prices as well, with the threat to sink a North Korean tanker if it loads oil from a rebel-held port being taken seriously in the markets," said analyst Joe Conlan at energy consultancy Inenco.
Tim Evans of Citi Futures said that the weekly US oil stocks report due out tomorrow was the key factor in the WTI loss.
He said that the average expectation is for a two-million barrel rise in total crude stocks, while products will fall.