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An Iranian warship was hit by a friendly fire missile during naval exercises, killing 19 sailors, state media and the army said on Monday.
The incident involving the Konarak vessel occurred on Sunday afternoon near Bandar-e Jask, off the southern coast of the Islamic republic, state television's website said.
"The vessel was hit after moving a practice target to its destination and not creating enough distance between itself and the target," said the channel.
Nineteen crewmen were killed and 15 injured in an "accident" during the exercises, the armed forces said, without elaborating.
The vessel had been towed ashore for "technical investigations", it said in a statement, calling on people to "avoid speculation" until further information is released.
Tasnim news agency said in an English-language tweet that the Konarak was hit by the missile fired by another Iranian warship.
The vessel had been hit by "'friendly fire' after Moudge-class frigate 'Jamaran' accidentally shot (it) with a missile during live firing exercise in Jask area of #PersianGulf waters".
The 15 injured were hospitalised in Sistan and Baluchistan, said Mohammad-Mehran Aminifard, head of the province's medical university.
Two of the sailors were in intensive care, he told the semi-official news agency ISNA.
Iran's army chief and foreign minister offered their condolences to the sailors' families in separate statements.
The attack wounded at least seven Syrian troops, according to the official SANA news agency, which said the missiles were launched by warplanes over the Israeli-occupied Golan Heights.
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Nearly 4,000 people have also been injured since the protests against chronic unemployment, poor public services and widespread corruption erupted in the capital on Tuesday, the commission said.
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