Iran's navy says it has test-fired a medium-range surface-to-air missile during a drill in international waters near the strategic Strait of Hormuz - the passageway for one-sixth of the world's oil supply.
State TV says the missile is designed to evade radars and was developed by Iranian scientists.
The report did not provide further details or say when the missile was tested.
A spokesman for the exercise, Rear Admiral Mahmoud Mousavi, says torpedoes will be used in the drill today.
The exercise covers a 1,250-mile (2,000-kilometre) stretch of water beyond the Strait of Hormuz, including parts of the Indian Ocean and the Gulf of Aden.
The drill could bring Iranian ships into proximity with US Navy vessels that operate in the same area.