The Gibraltar Chronicle says the development means a last minute application by the U.S. Department of Justice to extend the ship’s detention prompted the Supreme Court to adjourn its decision until later Thursday.
The Justice Department didn’t immediately respond to a request for comment.
The tanker was seized last month in a British Royal Navy operation off Gibraltar. It’s suspected of violating European Union sanctions on oil shipments to Syria, and its seizure deepened international tensions in the Persian Gulf.
The Gibraltar government says it is seeking to “de-escalate” the situation over the Grace 1.