Iran's navy started ten days of maneuvers in the Persian Gulf on Saturday, official news agency IRNA reported.
It quoted naval commander Admiral Amir-Habibollah Sayari as saying the drill started over an area of 2,000 kilometers, from the Sea of Oman to the east of the Strait of Hormuz.
The armed forces have increased their maneuvers following renewed speculation about possible U.S or Israeli airstrikes against the country's nuclear sites.
Iran has so far denied having any plans to close the Strait of Hormuz, a vital transit route for international oil shipments.
But Foreign Ministry spokesman Ramin Mehmanparast said last week that "if the region faced a war-like situation, then everything would then become war-like."
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