Footage from Iran's Press TV shows the Shahab-3 missile being tested
Iran has successfully test-fired some of the longest range missiles in its arsenal, state media say.
The Revolutionary Guards tested the Shahab-3 and Sajjil rockets, which are believed to have ranges of up to 2,000km (1,240 miles), reports said.
The missiles' range could potentially permit them to reach Israel and US bases in the Gulf, analysts say.
The tests come amid heightened tension with the big international powers over Iran's nuclear ambitions.
Last week, Iran disclosed it was building a second uranium enrichment plant, despite UN demands that it cease its enrichment activities.
Jon Leyne, BBC Tehran correspondent
These missile tests are being carried out as part of Iran's sacred defence week, so they were probably planned some time ago.
Nevertheless the West is likely to see this as a gesture of defiance just days after the latest revelation about Iran's nuclear programme. Iran may not mind too much about that interpretation.
Both the Shahab-3 and the Sajjil are capable of reaching much of the Middle East including Israel.
They make up what is probably Iran's strongest deterrent against any possible attack by Israel or the West.
Iran is due to hold crucial talks with the five UN Security Council members plus Germany on Thursday on a wide range of security issues, including its nuclear programme.
Iran's foreign ministry spokesman Hassan Qashqavi said the missile tests were merely part of an annual military drill, known as Sacred Defence Week, to commemorate its war with Iraq in the 1980s.
It was not a reaction to the nuclear crisis, he added.
"Many countries have these [displays] and it has nothing to do with Iran's peaceful nuclear technology," he told a news conference.
France called on Tehran to immediately stop "these deeply destabilising activities".
In a statement, the foreign ministry urged Iran to co-operate "by responding without delay to the demands of the international community to reach a negotiated settlement on the nuclear question".
But Russia appealed for restraint, saying the world should not "succumb to emotions" in dealing with Iran.
"The main thing is to launch productive negotiations [with Iran]," a foreign ministry source told Interfax news agency.
Gesture of defiance
"An improved version of Shahab-3 and the two-stage Sajjil, powered by solid fuel, were fired," the Guards' air force commander Hossein Salami was quoted as saying by the state-owned Arabic language TV channel al-Alam.
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