Oil prices tumbled after data showed an unexpected increase in U.S. crude supplies.
Diesel futures dropped to the lowest level since 2004 as U.S. stockpiles of distillates, a category that includes diesel fuel and heating oil, rose more than expected.
Light, sweet crude for February delivery settled down $1.27, or 3.35%, at $36.60 a barrel on the New York Mercantile Exchange. Brent, the global benchmark, declined $1.33, or 3.5%, to $36.46 a barrel on ICE Futures Europe.
