A U.S. military strike reportedly sank an Iranian naval warship in the Indian Ocean near Sri Lanka, according to officials and regional reports, marking a dramatic expansion of the ongoing U.S.-Iran conflict.
The vessel — identified as the IRIS Dena, a Moudge-class Iranian frigate — sank about 40 nautical miles south of Galle, Sri Lanka, after sending a distress call early Wednesday morning.
Video just now released showing the sinking of the IRIS Dena off the coast of Sri Lanka with an Mk. 48 torpedo. pic.twitter.com/oaZ2kGEwfC
— OSINTdefender (@sentdefender) March 4, 2026
Sri Lankan authorities stated that rescue teams from the Sri Lanka Navy and Air Force were dispatched to the area after receiving an emergency signal. About 32 injured sailors were rescued and taken to a hospital in Galle, while many other crew members remained unaccounted for in the immediate aftermath.
Casualties and rescue efforts
Reports indicate the warship had about 180 crew members on board, and the sinking left dozens injured and over 100 personnel missing, prompting a large search and rescue operation by Sri Lankan forces.
Sri Lanka’s government stated it provided humanitarian aid to survivors, stressing that its role was limited to rescue efforts and medical care for those saved from the water.
Part of a wider war escalation
The incident occurs amid a rapidly escalating military conflict involving the United States, Israel, and Iran. Over five days, U.S. and Israeli forces have targeted thousands of Iranian military sites, while Iran has responded with missile and drone attacks across the Gulf.
Analysts say the sinking of the Dena marks one of Iran’s most significant naval losses in the conflict so far and indicates that the fighting has spread well beyond the Persian Gulf into the Indian Ocean theater.
What the warship was doing in the region
The Dena recently participated in international naval events and exercises in India, including the International Fleet Review and the multinational Exercise MILAN, before starting its return voyage to Iran.
The frigate was part of Iran’s Moudge-class fleet, domestically built warships designed to carry anti-ship missiles, air-defense systems, and anti-submarine weapons.
Strategic implications
Military experts highlight that the attack shows how the conflict is now impacting major international shipping lanes and naval routes in the Indian Ocean — a region vital to global trade and energy transportation.
The incident also underscores the increasing danger of the war expanding geographically, as U.S. naval assets, Iranian vessels, and regional militaries operate in close proximity across multiple seas.
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