One Iranian warship accidentally struck another with a missile during an exercise, killing 19 sailors and wounding 15 others, Iran's navy said on Monday.
The incident took place during training in the Gulf of Oman, a sensitive waterway that connects to the Strait of Hormuz through which about a fifth of the world's oil passes. Iran regularly conducts exercises in the area.
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According to the Qatar-based Al Jazeera network, an Iranian destroyer accidentally fired a C-802 Noor missile at a sister warship during military exercises.
"The incident took place in the perimeter of Iran's southern Bandar-e Jask port on the Gulf of Oman during Iranian Navy drills on Sunday afternoon, in which 19 sailors were killed and 15 others were injured," state TV said, quoting the navy.
The Konarak, a Hendijan-class support ship, which was taking part in the exercise, was too close to a target during an exercise on Sunday when the incident happened, the reports said. The vessel had been putting targets out for other ships to target.
The friendly fire incident happened near the port of Jask, some 1,270 kilometers (790 miles) southeast of Tehran, in the Gulf of Oman, state TV said.
A local hospital admitted 12 sailors and treated another three with slight wounds, the state-run IRNA news agency reported.
Iranian media said the Konarak had been overhauled in 2018 and was able to launch sea and anti-ship missiles. The Dutch-made, 47-meter (155-foot) vessel was in service since 1988 and had a capacity of 40 tons. It usually carries a crew of 20 sailors.
Iranian media rarely report on mishaps during its exercises, signaling the severity of the incident. This incident also comes amid months of heightened tensions between Iran and the US since President Donald Trump unilaterally withdrew from Tehran's nuclear deal with world powers in 2018 and imposed crushing sanctions on the country.