Tehran announces trip by Rafael Grossi following revelation that IAEA inspectors found uranium enriched to 84% purity, the closest Iran has come to weapons-grade

WSJ reports particles of near-weapons-grade uranium could have been accidentally produced during recent trials in speeding up the enrichment process at Fordo plant

Nuclear watchdog says it detected 2 centrifuge cascades at Fordo facility interconnected in 'a significantly different way' to what Tehran declared

Country's atomic agency says it has provided 'explanations' about altered configuration of devices and the matter has been resolved

IAEA flags 'substantial' revision to links between IR-6 cascades enriching uranium to 60%; Tehran claims report based on flubbed data from inspectors that was since corrected

IAEA chief Rafael Grossi says he may return to Iran to jumpstart 'much needed' talks to curb atomic program, notes 'big, big impasse'

UN nuclear watchdog representatives to visit Iran Sunday to try to resolve deadlock after traces of radioactive material found at undeclared sites

Tehran's atomic agency chief hopes to make 'effective progress' with IAEA on nuclear material found in 3 undeclared sites

Nuclear watchdog's mission will be to record all attempts to 'externally influence' sites, Shmygal declares, amid fears of continued Russian shelling around the plants

UN nuclear watchdog has been pressing Tehran for months for a credible explanation, saying until one was received it could not guarantee the integrity of Iran's nuclear program.