West Texas Intermediate oil and Brent crude extended their losses on Wednesday after the U.S. government reported that stockpiles in the country rose to the highest level since 1990. May WTI futures decreased by 88 cents to $96.31 a barrel on the NYMEX and the Brent crude futures with delivery in the same month dropped $1.26 to $109.43 a barrel on the London's ICE.