Oil prices fell on Wednesday for a second straight day, with Brent hitting its lowest in two weeks after official figures showed a surprise jump in US inventories of crude.
Brent crude dropped $1.36, or 1.6 per cent, to $83.22 a barrel by 0130 GMT, a two-week low, having declined by 2.1 per cent in the previous session.
US oil fell $1.28, or 1.6 per cent, to $81.38 a barrel, a one-week low, after dropping 2.4 per cent on Wednesday.
Crude stocks rose by 4.3 million barrels last week, the US Energy Department said, more than double the 1.9 million-barrel gain forecast by analysts.
The "hefty" stock build came "on the back of a large jump in net imports of crude oil and still sluggish refinery processing," Citi Research commodities analysts said in a note.
Still, gasoline stocks fell by 2 million barrels to the lowest in nearly four years, even as US consumers struggle with rising prices to fill their tanks.
At the WTI delivery hub in Cushing, Oklahoma, crude storage is the most depleted in three years, with prices for longer-dated futures contracts indicating supplies will stay low for months.
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