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, a spokesman said on Saturday. The spokesman for Iran's Atomic Energy Organisation said the agency had activated 20 IR-4 and 20 IR-6 centrifuges as a third step in the Islamic republic's reduction of its commitments under a 2015 nuclear deal. "The centrifuge machines, as ...