According to Reuters, oil prices fell after data suggested US inventories of crude oil increased.
On the day for August 13th, Brent crude futures dropped three-tenths of a percent down to $72.61 per barrel.
But West Texas Intermediate crude was down seven-tenths of a percent, trading at $67.20 per barrel.
Data from a market intelligence firm found that inventories at a delivery hub in Oklahoma rose by 1.7 million barrels in one week.