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

FBI says man sent confidential documents to Iran while working at a Michigan company that serves the auto and aerospace industries

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'

US calls blocking of UN official from nuclear site an 'outrageous provocation,' warns Tehran to not 'test the international community's resolve'

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'

Top UN nuclear inspector said to tell diplomats that Tehran is thwarting his agency’s bid to inspect warehouse, flagged by Israel, where uranium particles were found

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