Iran is planning naval maneuvers in international waters near strategic Strait of Hormuz , where one-fifth of world oil supply passes.
According to the official IRNA news agency, Iran's navy chief Admiral Habibollah Sayyari said the maneuvers will begin on Friday from the Strait of Hormuz to the northern part of Indian Ocean in an area of about 400,000 square miles. 
Iran in the past has threatened to close the strait over Western sanctions aimed at its suspected nuclear program, but has not repeated the threat lately, Fox News reports.
Sayyari said Iran will test-fire missiles and deploy vessels and submarines during the six-day war games.
According to the report, the semi-official Fars news agency reported that navy of the powerful Revolutionary Guards began a limited naval drill on Tuesday in central part of the Persian Gulf.
It said the four-day maneuver is meant to test and assess its forces and includes missile firing, the report said.
Iran regularly holds military exercises to test and upgrade its military equipment and to boost its regional military standing.
The latest drills come as the West has increased its pressure over Iran's nuclear program.
The West suspects Iran is aiming to produce nuclear weapons.
Iran has, however, denied the charge, insisting its nuclear activities have peaceful purposes like power generation and cancer treatment, the report added.