The governing board of the International Atomic Energy Agency, the nuclear watchdog of the United Nations, will hold a special session on Tuesday, at the request of Britain, France and Germany.
It is thought the European trio called the IAEA meeting to warn Iran against restarting uranium processing, as Tehran has repeatedly threatened to do over the last week.
A senior Iranian negotiator said on Friday that his country would restart work at a uranium conversion plant near Isfahan regardless of new incentives being offered by the European Union.
The EU says the move would end two years of talks over the nuclear issue and could lead to Iran being referred to the United Nations Security Council for possible sanctions.
As President Mahmoud Ahmadinejad took office on Wednesday, he said what he called “elements of global threat including weapons of mass destruction” should be eradicated. Western countries fear Iran’s nuclear programme is a front hiding efforts to build atomic bombs, but Tehran insists it needs nuclear energy to meet booming electricity demand. In proposals submitted on Friday, Britain, France and Germany reportedly offered to allow Western companies to build nuclear power stations in Iran and supply fuel for them. Iran says the EU trio also offered to support it as the main transit route for oil and gas pipelines from Central Asia.