Iran has started a new round of enriching uranium only days ahead of a UN deadline for it to stop the strategic nuclear-fuel work, diplomats told on Wednesday.
"They put in small quantities of (feedstock) uranium hexafluoride (UF6) gas last week," into the centrifuges which enrich uranium, a diplomat close to the UN-watchdog International Atomic Energy Agency said.
A second diplomat, who like the first asked not to be named, said the amount of UF6 gas being fed was very small, 'under 10 kilos', and that the work was continuing this week ahead of Thursday's deadline for Iran to heed a UN call for it to halt all enrichment-related activities.
Uranium enrichment makes fuel for civilian nuclear reactors but could also produce atom-bomb material.
Diplomats said there had been a pause in actual enrichment until last week, when Iran was running centrifuges dry, without the feedstock gas.