Oil prices extended losses on Tuesday after an industry group reported a far larger rise in weekly U.S. crude stockpiles than anticipated.
U.S. crude oil in storage rose by 14.2 million barrels last week, according to the American Petroleum Institute. That was more than five times analysts' forecasts for a 2.5-million barrel increase.
Gasoline stocks rose by 2.9 million barrels, compared with analysts' expectations in a Reuters poll for a 1.1-million barrel gain.
U.S. crude was trading at $51.72 after ending Tuesday's trade down 84 cents, or 1.6 percent, at $52.17.
Benchmark Brent crude was down $1.03, or 1.9 percent, to $54.69 a barrel by 4:50 p.m. (2150 GMT).
Concerns that U.S. gasoline consumption is stalling weighed on futures. U.S. gasoline prices fell 2.3 percent.