The U.S. Coast Guard said a cargo ship has spilled oil into Honolulu Harbor.

Coast Guard Petty Officer 2nd Class James Connor said local and federal officials are working on cleanup after a 433-foot container ship spilled oil a day earlier during a fueling operation.

It is not immediately clear how much oil spilled or how much fuel the vessel holds. It's owned by the U.S. shipping company Matson Inc.

Absorbent material was placed around the ship, and about 120 gallons of oil has been recovered so far.

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A Coast Guard flight confirmed oil has leaked outside a containment area and is washing ashore across the harbor on Sand Island. Officials said there are no reports of wildlife being injured.