US commercial crude oil inventories increased by 17.4 million barrels to 424.4 mmbbls in the week ended Aug. 7, the Energy Information Administration said in its weekly report on Wednesday.
Crude inventories were about 2% below the five-year average for this time of year, the EIA said.
The larger-than-expected build is above Investing.com's estimate of a 1.7-mmbbl draw for the week ended Aug. 7.