Defence Minister Mostafa Mohammad Najjar did not say how the new weapon differed from the Shahab-3, a missile officials had previously said could hit targets 2,000 km away, far enough to reach Iran's arch-foe Israel.

"The Islamic Republic of Iran has never aimed to launch an attack on any country. It will never do so. But if someone wants to invade Iran, they will face a crushing response by the armed forces," Najjar said, the state broadcaster's Web site reported.

Washington has not ruled out military action if diplomacy fails to end a row over Iran's nuclear program, which the West says is aimed at building atomic bombs. Tehran says it wants to master technology to produce electricity not make warheads.

Iran's failure to convince world powers of its peaceful intentions has prompted two rounds of U.N. sanctions and the United States is pushing for a third, tougher set of penalties.

"The construction of the Ashoura missile, with the range of 2,000 km, is among the accomplishments of the Defence Ministry," the minister told a gathering of the Basij religious militia, holding maneuvers this week, Iranian media reported.

Iran unveiled another new missile, Ghadr-1, with a range of 1,800 km (1,125 miles) at a military parade in September and, at that time, referred to the Shahab-3 as having a range of just 1,300 km (810 miles). Prior to the parade and since then, officials said the Shahab-3 could reach targets 2,000 km away.

Najjar also said a new Iranian-built submarine would be delivered to the navy on Wednesday.