US, Iran clash over whether sunk warship was armed

US releases explosion footage as Hegseth claims submarine sank Iranian warship

US Defense Secretary Pete Hegseth said a U.S. submarine sank what he described as an "Iranian warship" in the Indian Ocean on March 4.

NEW DELHI - The United States and Iran have presented starkly conflicting versions of last week’s sinking of an Iranian warship in the Indian Ocean, with Washington dismissing Tehran’s assertion that the ship was unarmed, while Iranian officials maintain it was engaged in a noncombat mission. 

What they're saying:

The United States Indo-Pacific Command on Sunday rejected Iran’s claim that the warship IRIS Dena was unarmed when it was sunk in a submarine attack in international waters off Sri Lanka on March 4. In a statement on X, INDOPACOM called Iran’s assertion that the vessel was unarmed "false."

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The other side:

The response followed strong objections from Tehran, which has repeatedly characterized the warship as defenseless, saying it was returning home after taking part in a naval exercise.

An Indian navy official, speaking on condition of anonymity because he was not authorized to brief the media, said the Iranian vessel was not "entirely unarmed" and had taken part in drills alongside other countries’ warships.

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Iran’s Deputy Foreign Minister Saeed Khatibzadeh said Friday that the warship, sunk by a U.S. torpedo, had not been carrying weapons and accused Washington of targeting a ceremonial vessel.

"That vessel was by invitation of our Indian friends, attending an international exercise. It was ceremonial. It was unloaded. It was unarmed," he told reporters in New Delhi.

Big picture view:

Some experts have, however, suggested that visiting ships at such events typically do not carry a full combat load of live munitions unless scheduled for live-fire drills. They say even during the sea phase of exercises, ships generally carry only tightly-controlled ammunition limited to specific drills.

The backstory:

The IRIS Dena was sunk on March 4 in the Indian Ocean near Sri Lanka after being struck by a torpedo fired from a U.S. submarine, according to American and Iranian officials. The Sri Lankan navy rescued 32 sailors and recovered 87 bodies.

U.S. Defense Secretary Pete Hegseth described the IRIS Dena as a "prize ship" and said it "died a quiet death." Iran’s Foreign Minister Abbas Araghchi described the attack as "an atrocity at sea" and stressed that it had been "a guest of India’s Navy."

Disputes over whether the vessel was armed have intensified tensions over the incident, which occurred as it was returning from multinational naval exercises in India, and raised questions about whether it was operating in a noncombat role when it was attacked.

India’s defense ministry said in a statement after the exercises that "live firings as part of surface gun shoots, as well as anti-air firings, were also undertaken" by participating vessels.