An Iranian warship was “accidentally hit by a missile” fired by another Iranian ship during an exercise in the Gulf of Oman. The accident killed 19 Iranian sailors and wounded 15 more. 

The stricken support ship Konarak was hit by a new anti-ship missile being tested by the frigate Jamaran during an exercise on Sunday. Iranian state media initially reported that the ship had sunk, but later said that it was towed to port for “an inspection.”

The Konarak had been putting targets out in the water in the Strait of Hormuz and remained too close to one, according to the statements of the Iranian Navy. “The vessel was hit after moving a practice target to its destination and not creating enough distance between itself and the target,” Iranian state television reported.

“The circumstances of the incident are currently undergoing technical examinations,” Iran’s Student News Agency (ISNA) said.

The Iranian military released a statement on the Islamic Revolutionary Guards Corps’ website saying, “On Sunday afternoon, during an exercise by a number of the navy’s vessels in Jask and Chabahar waters, the Konarak light support vessel had an accident. The number of this accident’s martyrs is 19 and 15 have also been injured.” The statement added that the vessel had been towed ashore.

The incident took place near the port Jask, about 790 miles southeast of Tehran in the Gulf of Oman.

According to state media, the Dutch-made Hendijan-class support ship Konarak had been overhauled in 2018. The 47-meter (155-foot) vessel could carry up to 40 tons; it usually had a crew of 20 soldiers.

Iran regularly holds military exercises in the area, which is closed off to the Strait of Hormuz. Some 20 percent of the world’s oil passes through the Strait.