I do not know if they just stopped production of uranium hexafluoride UF6 gas, (in case they should destroy their centrifuges) or as well stopped making yellowcake uranium ore.
Iran has accepted a full suspension of uranium enrichment and linked activities, diplomats said Sunday.
The diplomats said the Iranians apparently dropped demands to modify a tentative deal worked out last weekend with European negotiators and had agreed to their conditions not only to keep a freeze on enrichment in force but to also suspend related activities.
Washington has argued that Iran's enrichment activities are part of a nuclear arms program.
The diplomat said, however, that Iran had not yet fulfilled a key part of the deal - formally informing the UN nuclear watchdog agency of its decision and asking for its inspectors to help ensure it keeps its word.
"They have yet to see it in writing," he said, alluding to the International Atomic Energy Agency, based in Vienna. "Details are important, so they have to see it."
As negotiators for France, Germany and Britain struggled with the Iranian counterparts to bridge differences over the weekend, the IAEA delayed a report on Iran's nuclear activities scheduled for limited circulation to diplomats accredited to the UN nuclear watchdog.
A diplomat familiar with the IAEA said the delay was meant to give the two sides a chance to resolve the dispute and allow agency head Mohamed ElBaradei to include an Iranian commitment to full suspension of uranium enrichment and related activities in his report.
That report was expected to be circulated Monday. One of the diplomats said agency officials were hoping that an Iranian letter of commitment would come either late Sunday or early Monday, in time for inclusion in the report.