The U.S. Justice Department has asked authorities in Gibraltar to halt their planned release of an Iranian supertanker seized by British marines in July, in the Trump administration’s latest escalation of tensions with Tehran. Iran condemned Britain’s seizure of the Grace 1 ship last month, saying it was a violation of the landmark nuclear deal from which the Trump administration withdrew last year. Britain accused the tanker of transporting oil to Syria in breach of European Union sanctions. Iran retaliated days later by impounding a British tanker in the Strait of Hormuz.