Plans to restart some uranium conversion work, a precursor to uranium enrichment, has sparked diplomatic warnings of UN Security Council involvement.
The processes had been frozen as part of an interim deal with the European Union, but comments attributed to a senior Iranian nuclear official suggest the country could announce a resumption of such activity at any moment.
The comments are believed to refer to work at a uranium conversion facility near Isfahan that is used to convert uranium yellowcake into uranium tetrafluoride and then into uranium hexafluoride, a feed gas for enrichment centrifuges.
