An explosion damaged a tanker close to its waterline as it sailed off Oman, a marine monitor said on Tuesday, as tensions remained high around the blockaded Strait of Hormuz. “The crew and vessel are safe, although the master reports some bunker fuel has discharged into the sea,” UK Maritime Trade Operations said. The incident, in the Gulf of Oman about 60 nautical miles east of Muscat, was an “external explosion”, UKMTO added, without detailing the cause of the blast. Iran has been laying mines