Crude-oil futures on Wednesday extended their sell off, and gasoline futures ended at their lowest since December 2010 after a report pointed to a surprise increase in inventories for both commodities.

On the New York Mercantile Exchange, light, sweet crude futures for delivery in November lost $1.54, or 1.7%, to settle at $87.31 a barrel. That was the largest one-day dollar and percentage decrease in a week and the lowest settlement for a most-active contract since April 2013. November Brent crude on London’s ICE Futures exchange fell 73 cents, or 0.8%, to end at $91.38 a barrel. That was Brent’s lowest settlement since June 2012. Oil added to losses earlier Wednesday after the Energy Information Administration reported a surprise increase for U.S. crude-oil inventories. Crude supplies rose by 5 million barrels in the week ended Oct. 3, the EIA said. That contrasted with expectations of a 2.1 million-barrel increase, according to analysts polled by Platts. Gasoline inventories rose 1.2 million on the week, and supplies of distillates increased by 400,000 barrels, the EIA said. The analysts polled by Platts had expected gasoline stocks to decline 1.1 million barrels and distillate supplies to decrease by 800,000 barrels.

Gasoline for November delivery fell nearly 5 cents, or 2.1%, to settle at $2.3184 a gallon on the Nymex. That was gasoline’s lowest settlement since December 2010. The unexpected increases in U.S. supplies come as markets are still spooked by the International Monetary Fund’s dim global economic growth forecasts out on Tuesday, which cast doubt on oil demand worldwide. “We haven’t really seen a significant shift in fundamentals. The investor base has become increasingly bearish on the lack of supply disruptions that were expected following Middle Eastern geopolitical events that haven’t eventuated,” Daniel Hynes, senior commodities strategist at ANZ Bank said. While the sell off is overdone for the moment, the downward momentum in oil is strong and it will be hard to turn around outside of some supportive economic or inventory data, he said.