Oil futures rose sharply early Friday, trading at their highest since October with support tied to cold weather in the U.S. and elsewhere and supply concerns.

Oil prices rose on Wednesday as supplies from Russia and OPEC members tightened, while data showing an unexpected increase in U.S. jobs openings pointed to expanding economic activity and consequent growth in oil demand.

Oil prices hit a near three-month high on Wednesday as concerns about supply disruptions and optimism over rising demand supported the market. “Concerns over Iranian and Russian oil flows will also be providing some support,

Oil futures settled with a loss on Wednesday after the U.S. Energy Information Administration reported that commercial crude inventories fell for a seventh straight week, but gasoline and distillate stockpiles climbed by more than 6 million barrels each.

Oil prices settled higher on Tuesday, driven by concerns over limited supply from Russia and Iran because of Western sanctions and expected higher Chinese demand. Brent crude futures settled at $77.05 a barrel,

Crude oil prices rose to a three-week high amid mounting concerns over supply disruptions and increasing demands. However, technical analysts caution that oil markets may be over-bought. View on euron