The head of the UN's nuclear agency has warned Iran to continue to co-operate over inspections of its nuclear industry or face serious consequences.
Iran's burgeoning nuclear industry is based on Russian technology
Mohammad ElBaradei said Iran must prove its plans were not weapons-related.
"It will have serious implications if they do not continue to co-operate fully," he told reporters at the World Economic Forum in Davos.
Iran has hit back at the EU after suggestions that it was not honouring a recent promise to admit inspectors.
UK Foreign Secretary Jack Straw said after talks with Iranian President Mohammad Khatami in Davos on Wednesday that the country had still to deliver on its promises to allow outside inspectors to examine its nuclear sites.
Mr Straw and his French and German counterparts, Dominique de Villepin and Joschka Fischer, reached agreement in Tehran in October on Iranian compliance with the requirements of Mr ElBaradei's agency, the International Atomic Energy Agency (IAEA).
On Thursday, Iranian radio reported that President Khatami had told Mr Straw that Iran had fulfilled its commitments and was calling on EU states to do likewise.
Mr ElBaradei said it was "very important for the IAEA to come to a conclusion that the Iran programme is for peaceful purposes".
The agency, UN's top nuclear inspector said, had found no recent indications that Iran had been seeking enrichment technology abroad and was now checking if Iran had sought to manufacture such technology domestically.
"We are working with them to verify the suspension of all enrichment activities and I think we are making good progress
and I hope we will continue to be able to make further progress," the IAEA chief added.