Ali Akbar Salehi says production of low-enriched uranium increasing after operations at Fordo underground site resumed; Rouhani: Nuke deal could open up international arms sales

Enrichment up from 3.67% limit established in 2015 deal; Tehran doubles down on claim that security check last week exposed a UN inspector's tie to possible sabotage of the program

US secretary of state calls blocking of UN official from nuclear site an 'unwarranted act of intimidation,' says alarmed by Tehran's 'lack of adequate cooperation'

PM accuses Islamic Republic of lying about alleged atomic facility in Tehran; Gantz calls resumption of work at Fordo a 'wake-up call for the world'

Pompeo urges international community to step up pressure after Tehran resumes enrichment; EU expresses 'deep concern' over cancellation of IAEA inspector's accreditation

Tehran says woman triggered an alarm last week at the entrance to the Natanz uranium enrichment plant

Tehran's decision to reactivate the secret underground uranium enrichment facility is meant to pressure the US to repeal sanctions, but could provoke an Israeli strike

As 2015 atomic deal crumbles, officials say Islamic Republic harassed IAEA official at Natanz site

Halting uranium enrichment at the heavily fortified Fordo was a major victory for the 2015 nuke deal; its reopening is seen as a dramatic bid by Tehran to leverage sanctions relief

IAEA inspectors on hand for move in latest pullback from nuclear deal; state TV says enrichment comes in reaction to increased US pressure, inactivity of Europe to save the deal