
The UN nuclear watchdog's governing body has passed a resolution condemning Iran for developing a uranium enrichment site in secret.
The International Atomic Energy Agency (IAEA) also demanded that Iran freeze the project immediately.
The resolution, the first against Iran in nearly four years, was passed by a 25-3 margin with six abstentions.
But Iran's Foreign Ministry dismissed the resolution, calling its passage theatrical and useless.
Iran says its nuclear programme is for peaceful energy purposes, but the US says it is seeking nuclear weapons.
In September, it emerged that as well as its uranium enrichment facility at Natanz, Iran had a second such facility near the town of Qom.
The revelation deepened Western fears about the country's nuclear ambitions.
'Clear signal'
The IAEA resolution was passed with rare Russian and Chinese backing. Only Cuba, Venezuela and Malaysia voted against it.
It called on Iran to reveal the purpose of the second plant and confirm that it is not building any other undeclared nuclear facilities.
Speaking at a Commonwealth summit in Trinidad and Tobago, British Prime Minister Gordon Brown said that the vote sent the clearest possible signal to Iran.
"I believe the next stage will have to be sanctions if Iran does not respond to what is a very clear vote," he said.
Russia's Foreign Ministry urged Iran to react "with full seriousness" to the resolution, while the US ambassador to the IAEA, Glyn Davies, said it showed that "patience is running out".
"We can't have round after round of fruitless negotiations... that don't get us where we want to get," the US envoy said.
But Iranian Foreign Ministry spokesman Ramin Mehmanparast called the IAEA vote "a theatrical move aimed at pressuring Iran" that would be "useless", state news agency Irna reported.
And Iran's ambassador to the IAEA, Ali Asghar Soltanieh, said it was a "hasty and undue" step that would jeopardise the chances of success in negotiations.
"The great nation of Iran will never bow to pressure and intimidation vis-a-vis its inalienable right to peaceful uses of nuclear energy," he said.
The resolution came a day after the outgoing head of the IAEA, Mohamed ElBaradei, expressed frustration at Iran's refusal to accept an international proposal to end the dispute over its nuclear programme.
The plan envisages Iran's low-enriched uranium being shipped overseas for processing into fuel. This is seen as a way for Iran to get the fuel it wants, while giving guarantees to the West that it will not be used for nuclear weapons.
Addressing IAEA governors in Vienna on Thursday, Mr ElBaradei said his inspectors had made no progress in their attempts to verify the peaceful nature of Iran's nuclear programme. BBC
"It is now well over a year since the agency was last able to engage Iran in discussions about these outstanding issues," he said. "We have effectively reached a dead end, unless Iran engages fully with us."


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