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US submarine sank Iranian warship in Indian Ocean with torpedo, Hegseth says

The US Navy used a Mark 48 torpedo to sink the Iranian frigate IRIS Dena, killing at least 87 crew members and rescuing 32, marking the first such attack since World War II.

  • A U.S. military submarine sank the Iranian warship IRIS Dena about 40 km south of Sri Lanka, marking the first torpedo sinking since World War II according to U.S. Defence Secretary Pete Hegseth.
  • Sri Lanka's navy rescued 32 critically wounded sailors from the sunken Iranian frigate, while around 100 to 140 crew members are reported missing amid ongoing rescue operations.
  • The attack increased regional tensions, including NATO member Turkey shooting down a drone heading toward its airspace, linked to the broader U.S.-Iran conflict.
  • Iran's military warned that U.S. and Israeli actions could collapse the region's military and economic infrastructures amid ongoing hostilities.
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An Iranian warship was destroyed by a US attack submarine.

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CNN Greece broke the news in Greece on Tuesday, March 3, 2026.
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