TEHRAN: An Iranian naval vessel sank in the Gulf of Oman Wednesday after efforts to put out a fire failed, but the crew safely disembarked, the navy said.

The fleet replenishment tanker Kharg had caught fire on Tuesday near the port of Jask on the Gulf of Oman.

The fire broke out in "one of the systems" of the vessel, a navy statement said without elaborating.

Firefighting efforts continued "for 20 hours" before the ship went down, it said.

"Considering the spread of the fire, the mission to save the Kharg failed and it sank in waters off Jask."

It added that the vessel had left for a "training mission" in international waters days ago.

Last year, an Iranian warship was hit by friendly fire during a naval exercise off Jask, killing the 19 sailors onboard.

The port lies close to the Strait of Hormuz, the strategic chokepoint at the head of the Gulf through which a fifth of world oil output passes.—AFP