Oil slid more than 3% towards $40 a barrel on Tuesday, its 5th session of decline, pressured by concerns that a recovery in demand could weaken as coronavirus infections flare up around the world.
Coronavirus cases rose in 22 of the 50 U.S. states, a Reuters analysis showed on the Labor Day holiday weekend. New infections are also increasing in India and Britain.
Brent crude fell $1.43, or 3.4%, to $40.58 a barrel at 1127 GMT, and earlier slipped to $40.55, the lowest since June 29. U.S. West Texas Intermediate (WTI) crude dropped $2.06, or over 5%, to $37.71.
On Monday, crude fell after Saudi Arabia's state oil company Aramco cut the October official selling prices for its Arab light oil, a sign demand may be stuttering.
"The price weakness is continuing today," said Eugen Weinberg, analyst at Commerzbank. "We believe this is attributable first and foremost to demand concerns."
Both oil benchmarks have dropped out of the ranges they were trading in throughout August. Brent has fallen more than 10% since the end of August.
"The streak of losses is driven by a stalling crude demand outlook for the rest of the year," said Paola Rodriguez-Masiu, analyst at Rystad Energy.
Still, oil has recovered from historic lows hit in April, thanks to a record supply cut by the Organization of the Petroleum Exporting Countries and allies, known as OPEC+. The producers are meeting on Sept. 17 to review the market.
Crude has also found support from a weaker U.S. dollar, although the U.S. currency was up on Tuesday. The market could rally beyond $45 later this year, said Norbert Ruecker, head of economics at Swiss bank Julius Baer.
"Fundamentally, things have not changed," he said. "Demand is recovering, supply remains constrained, and the storage overhang is slowly disappearing."
(Additional reporting by Sonali Paul and Seng Li Peng; Editing by Louise Heavens and David Evans)
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