Defying international concerns, Iran has resumed clandestine work linked to uranium enrichment, testing equipment and producing a gas that can be used to make nuclear warheads, diplomats say.
The diplomats said Tehran has restarted equipment used to make uranium hexaflouride gas, which can be enriched enough to make the weapons.
While Iran appears only to be testing the machinery, it has apparently produced some of the gas as a side effect, said the diplomats Wednesday. .
The move -- coupled with revelations Tuesday that Iran had restarted building centrifuges -- heightened concern that Iran was moving toward full uranium enrichment, despite pledges not to do so.
Iran dismisses accusations it is interested in making nuclear weapons, insisting its main interest in nuclear power is to generate electricity.