Iran’s state TV is reporting the country’s navy has begun manoeuvres in the area of the Strait of Hormuz, where one-fifth of the world’s oil passes.
It says the manoeuvres began early Friday, involving warships, submarines jet fighters and hovercrafts.
The drills come as international pressure over Iran’s nuclear programme increases. It is suspected Iran may be aiming to produce nuclear weapons, a charge Iran denies.
Iran has threatened to close the straits over Western sanctions, but has not repeated the threats lately.
The report says Iran warned ships to stay away from the site until January 3.
The manoeuvres cover nearly one million square kilometres from the Strait of Hormuz to northern parts of the Indian Ocean, including the Sea of Oman.