A UN watchdog report is expected to show that Iran has installed more uranium enrichment centrifuges at an underground site, potentially boosting output capacity of nuclear work. Two sources said the Islamic state may have placed in position nearly 350 machines since February - in addition to the almost 700 centrifuges already operating at the Fordow facility. Progress in Iran's nuclear program is closely watched by the West and Israel as it could determine how much time it would need to build nuclear bombs, should it decide to do so.