A senior Iranian naval commander has denied reports that the country has test-fired long-range missiles.
State media in Iran had reported that missiles were fired during a naval drill today.
Commander Mahmoud Mousavi said the missiles would be launched in the coming days.
Iran has threatened to close the Strait of Hormuz to oil tankers and is readying war game missile tests near the entrance to the Gulf.
The United States has warned a closure of the strait "will not be tolerated".
Earlier this week, Iranian Vice President Reza Rahimi threatened that "not a drop of oil" will pass through the channel if more Western sanctions are imposed over Tehran's nuclear programme.
Iran has brushed off the warning from the US, which bases its Fifth Fleet in the Gulf, with Iranian navy chief Admiral Habibollah Sayari saying it would be "really easy" to close the strait.
Commander Mousavi told state television: ''In the next days, we will test-fire all kinds of surface-to-sea, sea-to-sea and surface-to-air as well as shoulder-launched missiles" in the final stages of the war games.
He did not say exactly when the launches would start, but explained they would involve tests of "medium- and long-range missiles" to evaluate their operational effectiveness.
The navy exercises started on 24 December.
20% of the world's oil moves through the Strait of Hormuz, at the entrance of the Gulf, making it the "most important chokepoint" globally, according to information released by the US Energy Information Administration.
Around 14 crude oil tankers per day pass through the narrow strait, carrying a total 17 million barrels.
In all, 35% of all seaborne oil transited through there this year.
On Thursday, a US aircraft carrier and an accompanying missile cruiser passed through the zone where the Iranian navy was conducting its drill. US officials insisted it was a routine passage.
No confrontation occurred, though an Iranian military aircraft flew in close to record video of the aircraft carrier, which was then shown on state television.
