Illustrative: The oil tanker Mercer Street, which came under attack last week off Oman, is seen moored off Fujairah, United Arab Emirates, Wednesday, Aug. 4, 2021 (AP Photo/Jon Gambrell) FUJAIRAH, United Arab Emirates — The British navy says the hijackers who boarded a vessel off the coast of the United Arab Emirates in the Gulf of Oman have left the targeted ship, without elaborating. The notice on Wednesday came after the British military’s United Kingdom Maritime Trade Operations warned of a “potential hijack” under unclear circumstances underway the night before. The group reported that the “incident [is] complete.” It did not provide further details.