Video footage has been published showing a US Navy submarine attack on Iranian frigate IRIS Dena, which sank off the coast of Sri Lanka.

US Defense Secretary Pete Hegseth said the Iranian vessel was torpedoed in the Persian Gulf by an American submarine.

According to the Daily Mirror, approximately 180 people were on board. Sri Lanka's Deputy Foreign Minister Arun Hemachandra reported 80 deaths. Another 32 Iranians have been rescued and taken to hospitals on the island, with some in serious condition.

The IRIS Dena frigate is part of Iran's Southern Naval Fleet.