U.S. crude oil futures were on track for their biggest weekly decline since late October on Friday, with prices coming under pressure as top consumers impose travel restrictions amid the spread of the Delta variant of the coronavirus. U.S. West Texas Intermediate (WTI) crude futures have dropped 6.6% this week, the biggest weekly loss since the end of October. Brent crude oil futures have given up 6.6%, the most since mid-March and prices were down 2 cents at $71.27 a barrel on Friday.
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