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It said the worker died from a "mechanical injury" caused by a breach in a container of uranium hexafluoride, a chemical compound used in uranium enrichment.

The report said Iran's stock of uranium enriched to 60% and in the form of uranium hexafluoride, the gas that centrifuges enrich, was estimated to be 55.6 kg, an increase of 12.5 kg from the previous quarterly report.

AP also tracked millions of dollars worth of shipments of radioactive uranium hexafluoride from Russian state-owned Tenex JSC, the world’s largest exporter of initial nuclear fuel cycle products, to Westinghouse Electric Co. in South Carolina.

Until its latest move outlined in last Thursday's International Atomic Energy Agency report to member states, Iran's stock of uranium enriched to up to 60% was all in the form of uranium hexafluoride, the feedstock for uranium-enriching centrifuges.

Uranium hexafluoride can easily be diluted and transported, a process delegates at the talks have been discussing for months.