Nymex WTI crude futures firmed as tensions built over Iran's resumption of nuclear activities,with a referral to the UN Security Council looming.The shutdown of Nigerian output following the abduction of foreign oil workers and an explosion at an oil pipeline in the country boosted prices,More fund buying accompanied the rise in Nymex crude futures,and open interest increased to over 900,000 lots.Noncommercial traders cut net short positions to 14,403 for the week ending 3 January,down from 24,254 the previous week,signalling a more bullish market.And speculators raised length on Nymex-traded heating oil and gasoline.
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