Broader investor risk aversion also weighed on oil with the U.S.
dollar jumping to a nine-month high on signs the U.S. Federal
Reserve is considering reducing stimulus this year.
"The spread of the Delta variant amid moderating economic growth
and the prospects of tighter monetary policy are creating
short-term ripples in the commodity market," ANZ commodity
analysts said in a note.
"Increasing restrictions on mobility are raising concerns for
oil demand."
Brent crude futures fell 1.08 cents or 1.6% to $65.37 a barrel
at 1215 GMT, near their lowest since May and down over 7% for
the week.
U.S. West Texas Intermediate (WTI) crude futures for September,
due to expire on Friday, fell 1.07 cents or 1.7% to $62.62 a
barrel and were down over 8% for the week.
"The latest lockdowns in major economies around the world have
likely harmed the economic activities and growth forecasts in
the months to come," said Margaret Yang, a strategist at
Singapore-based DailyFX.
"Japan has extended its emergency lockdown and confirmed cases
are on the rise in countries such as South Korea, Malaysia,
Philippines, Vietnam and Thailand, whose industries need oil,
which will also be affected by the Delta variant," Yang added.
China has imposed new restrictions with its "zero tolerance"
coronavirus policy, affecting shipping and global supply chains,
and the United States and China have imposed tit-for-tat flight
capacity restrictions.
Meanwhile Delta variant outbreaks in Australia and New Zealand
have also sparked strict lockdowns.
The approaching end of the U.S. peak gasoline demand season and
end of summer holidays in Europe and the United States are also
set to sap oil demand.
"Aviation remains the weakest component of global demand at the
moment, and the risk of further restrictions on domestic and
international travel due to the Delta variant will be a key
variable for oil over the remainder of H2, particularly as the
U.S. driving season ends," said Stephen Innes, managing partner
of SPI Asset Management.
(Reporting by Dmitry Zhdannikov in London, Sonali Paul in
Melbourne and Koustav Samanta in Singapore; Editing by Simon
Cameron-Moore and David Evans)
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