"We hit an Iranian drone carrier ship roughly the size of a World War II aircraft carrier," Adm. Brad Cooper, head of U.S. Central Command, said.
A single Mk-48 torpedo achieved "immediate effect" on an Iranian frigate, which was operating in the Indian Ocean, the Pentagon confirmed.
A high-ranking member in the Iranian Armed Forces said Monday that any vessel traveling through the narrow maritime passage would be destroyed.
President Trump also said Iran's naval headquarters has been "largely destroyed" in a different attack.
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