Move could pave way for deal's final collapse; Brussels' top diplomat calls for 'intensive efforts' to solve disagreements 'in good faith by all'

Analysts say blast destroyed lab where Iran develops next generation centrifuges to speed up uranium enrichment; one source says Iran nuclear program set back two months

Top general says Tehran knows cause of incident that damaged a reported centrifuge assembly plant but would not make it public due to 'security reasons'

Kuwaiti newspaper cites unnamed senior source as saying Jerusalem behind recent incidents in Iran, following an alleged attempt by Tehran to hack Israel's water infrastructure

US experts cite satellite images and state TV reports; previously unknown Cheetahs of the Homeland says it is behind blaze

Tehran says no casualties or radioactive pollution in Natanz incident, claims Israeli social media took credit for 'sabotage,' warns 'Zionist regime' against 'crossing red lines'

Spokesperson confirms damage at 'industrial shed' near Natanz, which comes days after explosion rocked missile production facility near Tehran

In presence of journalists, authorities pour concrete for the base of Russian-funded facility

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'