At least one Iranian navy man was killed and several were injured in an incident on a military ship during a naval exercise in the Gulf of Oman, Iranian state TV reported on Monday.
The Gulf of Oman is a particularly sensitive waterway as it connects to the Strait of Hormuz - through which about a fifth of the world's oil passes - which in turn connects to the Gulf.
"The incident took place in the perimeter of Iran's southern Jask port on the Gulf of Oman during Iranian Navy drills on Sunday. At least one person was killed and several were injured," the broadcaster said, quoting the Iranian navy.