Iran's navy has begun a 10-day drill in international waters beyond the strategic Strait of Hormuz at the mouth of the Persian Gulf, the passageway for about a third of the world's oil tanker traffic.

The exercise could bring Iranian ships into proximity with U.S. Navy vessels in the area.

Navy chief Adm. Habibollah Sayyari says Iran is holding the war games to show off its prowess and defense capabilities. State TV broadcast his comments on Saturday.

The drill will be Iran's latest show of strength in the face of mounting international criticism over its controversial nuclear program, which the West fears is aimed at producing atomic weapons. Tehran denies those charges, insisting the program is for peaceful purposes only.

Beyond the Strait of Hormuz, a major passageway for the world's oil tanker traffic, lie vast bodies of water, including the Arabian Sea and the Gulf of Aden. The U.S. Navy's Bahrain-based Fifth Fleet is also active in the area, as are warships of several other countries that patrol for pirates there.

Both the U.S. and Israel have not ruled out a military option against Iran over its nuclear program, while Iranian hard-liners have come out with occasional threats that Tehran would seal off the key waterway if the U.S. or Israel moved against the country's nuclear facilities.

Sayyari told Iranian state TV that the maneuvers, dubbed Velayat-90, will begin on Saturday. He said they will be held in a 1,250-mile (2,000-kilometer) stretch of sea off the southern edge of the Arabian Peninsula and into the Gulf of Aden, near the entrance to the Red Sea.

Iran regularly holds war games and has also been active in fighting piracy in the Gulf of Aden.

Sayyari denied an Iranian media report from last week that the drill would close the Strait of Hormuz. "There has been no decision yet on this," he was quoted as saying by the official IRNA news agency.

However, he stressed that Iran's navy and the Revolutionary Guard have the capability to close the strait but that "any decision on this will have to come from the leader," referring to Supreme Leader Ayatollah Ali Khamenei.

Sayyari said Iranian navy would use submarines, warships, missiles and torpedoes as well as unmanned planes during the drill but that it would take place "within the framework of international norms."