Iran has started up advanced centrifuges to boost its stockpile of enriched uranium but will allow the UN atomic agency to continue monitoring its nuclear programme. Photograph: Henghameh Fahimi/AFP/Getty

Iran’s atomic energy spokesman has issued fresh warnings about its nuclear deal with world powers. Behrouz Kamalvandi of the Atomic Energy Organisati(...)

Iran’s Arak nuclear plant in 2011. Photograph: Hamid Foroutan/AFP/Getty Images

Iran said it would soon exceed limits on its enriched uranium stockpile agreed in a nuclear deal with world powers, increasing the urgency of European(...)