NEW YORK—U. S. oil prices fell for a fifth straight session Wednesday after weekly inventory data showed an unexpected increase in crude supplies.

Commercial crude-oil stockpiles rose by 400,000 barrels in the week ended July 3, the U.S. Energy Information Administration said Wednesday. Analysts surveyed by The Wall Street Journal had expected a drop of 1 million barrels. Supplies usually decline in the summer as refineries process more crude oil into gasoline and other fuels.

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