US Defense Secretary Pete Hegseth has claimed that an American submarine sank an Iranian warship in the Indian Ocean using a torpedo. The incident reportedly occurred near Sri Lanka, resulting in at least 80 deaths, according to Sri Lankan authorities. The country’s deputy foreign minister told local television that the vessel was returning to Iran from an eastern Indian port when it was attacked.

The Iranian frigate, identified as IRIS Dena, had participated in India’s multinational naval exercise ‘Milan 2026’. It had also joined the same exercise in 2024. After completing this year’s drill, the warship began its journey back to Iran but never reached its destination. Questions have since arisen about why the Iranian vessel was positioned near Sri Lanka at the time of the attack.

The sinking has drawn attention to rising tensions in the Indian Ocean region, though the source does not specify any official responses from Iran or the United States beyond the initial claim.