Secretary of defense tells House lawmakers Iranian nuclear program has seen 'remarkable' progress, as UN watchdog says it has enriched uranium to near weapons-grade

Corroborating earlier reports, IAEA says inspectors found traces of material at 83.7% purity in Fordo; Tehran says it's only enriched to 60%, which already has no civilian use

William Burns says US doesn't believe Iranian supreme leader has made decision to pursue weaponization, after Tehran found to have enriched uranium to 84% purity

News website linked to highest reaches of Iran's theocracy nods to allegation amid renewed pressure on West to address Tehran's program

Second resolution passed as Western powers ramp up pressure on Islamic Republic to explain undeclared uranium particles found in its facilities

IAEA report says Tehran now has 62.3 kilograms of uranium enriched to up to 60% fissile purity, which is a short step away from weapons-grade levels

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

High-level representatives not in attendance at negotiations, amid growing feeling in West that there is little room for further compromise to restore tattered 2015 deal

'The Americans must accept some commitments. We do not want an agreement at any price,' Hossein Amir-Abdollahian says

Rafael Grossi says project 'has grown enormously, far beyond what it was in 2015,' as Tehran creates new difficulties and negotiations remains stalled