Oil prices fell below USD 83 a barrel today in Asia as investors worried

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a 20 percent rally in the last few weeks isn't justified by sluggish US crude demand.

Benchmark crude for February delivery was down 33 cents to USD 82.85 a barrel at midday Singapore time in electronic trading on the New York Mercantile Exchange. Yesterday, the contract rose USD 1.41 to settle at USD 83.18, a 15-month high.

Investors have brushed off signs of weak U.S. Oil demand while bidding up crude prices from USD 69 a barrel in mid-December. The Energy Department's Energy Information Administration said yesterday that crude supplies rose last week.

"Above the USD 83 level, we would be viewing this price advance as falling within the 'bubble' category, a scenario that could play out in a much sharper than expected price plunge," Galena Illinois-based Ritterbusch and Associates said in a report.

Cold weather in parts of the US, Europe and Asia have helped support the recent jump in oil prices, as traders expect supplies of crude products such as heating oil to run low.

"With a colder-than-usual winter in most parts of the Northern Hemisphere, oil prices remain buoyant and well supported," Barclays Capital said in a report.