Oil prices dropped 2% on Monday, extending last week's steep losses on the back of a rising US dollar and concerns that new pandemic curbs in Asia, especially China, may set back the global recovery in fuel demand.
Brent crude futures slid $1.41, or 2%, to $69.29 a barrel by 0125 GMT, after having slumped 6% last week, their biggest weekly loss in four months.
US West Texas Intermediate (WTI) crude futures fell $1.32, or 1.9%, to $66.96 a barrel, after having slumped nearly 7% last week in their steepest weekly decline in nine months.
"Concerns about potential global oil demand erosion have resurfaced with the acceleration of the Delta variant infection rate," RBC analyst Gordon Ramsay said in a note.
ANZ analysts pointed to new restrictions in China, the world's second-largest oil consumer, as a major factor clouding the outlook for demand growth.
The curbs include flight cancellations, warnings by 46 cities against travel, and limits on public transport and taxi services in 144 of the worst hit areas.
On Monday, China reported 125 new Covid-19 cases, up from 96 a day earlier.
"While the number of cases (in China) is low, it comes just as the summer travel season peaks," ANZ commodity analysts said in a note. "This has overshadowed signs of strong demand elsewhere."
In Malaysia and Thailand, infections continue to hit daily records of more than 20,000.
Oil also fell as the US dollar rallied to a four-month high against the euro after Friday's stronger-than-expected US jobs report spurred bets that the Federal Reserve may move more quickly to tighten US monetary policy.
A stronger US dollar makes oil more expensive for holders of other currencies.
Trading was quiet with holidays in Japan and Singapore.
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