US Sinks Iranian Warship in Submarine Attack Off Sri Lanka, Tehran Says Ship Unarmed

On March 4, an Iranian warship identified as the IRIS Dena was sunk in the Indian Ocean near Sri Lanka.

“NEW DELHI — The United States and Iran have offered sharply different accounts of the sinking of an Iranian warship in the Indian Ocean last week, with Washington rejecting Tehran’s claim the vessel was unarmed and Iranian officials insisting it was operating in a noncombat role”

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Reporting attributes the sinking to a torpedo fired from a U.S. submarine, a detail credited to both U.S. and Iranian officials.

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Sri Lanka’s navy conducted rescue and recovery operations, rescuing 32 sailors and recovering 87 bodies from the incident.

Iranian authorities described the sinking in strongly worded terms.

The incident has raised immediate regional alarm about its scale and human cost.

Tehran condemned the strike as "an atrocity at sea," asserting that the Dena was unarmed and a guest of India's navy.

U.S. officials offered a contrasting characterization: U.S. Defense Secretary Pete Hegseth referred to the vessel as a "prize ship" that "died a quiet death."

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This divergence illustrates sharply different official narratives about the ship's status and the justification or portrayal of the strike.

Reporting ties the Dena’s voyage to the conclusion of multinational naval exercises in India, where some participants conducted live firings, a fact that has intensified debate over whether the Dena was operating in a noncombat role when it was hit.

“NEW DELHI — The United States and Iran have offered sharply different accounts of the sinking of an Iranian warship in the Indian Ocean last week, with Washington rejecting Tehran’s claim the vessel was unarmed and Iranian officials insisting it was operating in a noncombat role”

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The timing and proximity to those exercises, and the presence of other Iranian vessels seeking assistance, complicate assessments of intent and rules of engagement.

Available reporting quotes both U.S. and Iranian sources but does not provide independent verification of the attack’s full circumstances in the excerpted coverage.

The differing official characterizations — Tehran’s claim the Dena was unarmed and a guest of India’s navy versus U.S. officials’ characterization of it as a "prize ship" — leave key questions unresolved about the ship’s status.

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They also leave questions about whether it posed a threat and about the broader implications for regional escalation.