Oil prices reversed gains on Wednesday, as official government figures showed U.S. crude stockpiles rose last week, contradicting an earlier report showing a drop.
U.S. commercial crude inventories rose by 1.9 million barrels to 420.3 million in the week through Feb. 2, the U.S. Energy Information Administration reported.
That was lower than the roughly 3-million-barrel increase analysts anticipated in a pair of surveys. But data on Tuesday from the American Petroleum Institute had shown a decline of 1.1 million barrels, setting market expectations for a drop after the previous week's big rise.
U.S. West Texas Intermediate (WTI) crude futures fell 95 cents, or 1.5 percent, to $63.66 a barrel by 10:45 a.m. ET (1545 GMT). The contract hit a nearly one-month low and was trading down 4.6 percent this week.
Brent crude futures were down 46 cents to $66.40 a barrel. The contract is 3.2 percent for the week.