Head of Tehran’s nuclear agency says it will adhere to IAEA standards, claims international interest in subterranean facility at Natanz a result of Israel feeling pressured

Analysts say continued tunneling at Natanz facility, revealed by recent satellite images, complicates calculations for US and Israel as nuclear deal remains stalled

Bunker-busting ordnance is kept at base home to B-2 stealth bombers, the only aircraft that can deploy the bomb; but depth of Natanz tunnels likely presents a serious challenge

Report says inspectors from UN atomic agency made discovery last week, are probing if move was intentional; Tehran previously known to have enriched to 60%

Tehran accuses UN atomic energy agency and Western countries of trying to exert 'maximum pressure' amid two months of nationwide protests in the Islamic Republic

IAEA update finds installation of advanced centrifuges now complete at Natanz underground plant; Tehran says plans to add even more of devices banned under 2015 deal

Defense minister cites Israeli intelligence that uranium enrichment capabilities at Fordo site have tripled, calls on Security Council to prepare sanctions against Tehran

As nuclear deal talks hit fever pitch, IAEA report seen by Reuters says Tehran continuing 5% enrichment on IR-6 centrifuges at its underground Natanz plant

IAEA reports to its members that three cascades of advanced IR-6 centrifuges have been brought online at underground facility, according to Reuters

New York Times says US and Israeli officials have been monitoring new construction at Natanz for a year; Defense Minister Gantz first alluded to site in speech last month