VIENNA – The UN nuclear watchdog signaled its determination on Monday to get to the bottom of suspicions that Iran may have worked on designing an atomic bomb, a day after Tehran agreed to start addressing the sensitive issue. Chief UN nuclear inspector Tero Varjoranta said progress had been good during Feb. 8-9 talks in Tehran but that much work remained in clarifying concerns of possible military links to Iran's nuclear program, in an investigation which Western diplomats say Tehran has stonewalled for years. “There are still a lot of outstanding issues,” Varjoranta, deputy director general of the International Atomic Energy Agency (IAEA), said at Vienna airport after returning from the Iranian capital. “We will address them all in due course.” Iran denies Western allegations it seeks the capability to make nuclear weapons, saying such claims are baseless and forged by its foes. Years of hostile rhetoric and confrontation have raised fears of a new war in the Middle East. But a diplomatic push to resolve the decade-old dispute gained new momentum after last June's election of a relative moderate, Hassan Rouhani, as Iran's president on a platform to ease its international isolation. Iran and six powers agreed late last year on an interim deal to curb Tehran's nuclear work in exchange for some easing of sanctions that have battered the oil producer's economy and they will next week start talks on a long-term agreement. The IAEA investigation into what it calls the possible military dimensions (PMD) to Iran's nuclear actvity is separate from, but closely linked to, wider diplomacy between Tehran and the United States, France, Germany, Britain, Russia and China. The IAEA investigation is focused on the question of whether Iran sought atomic bomb technology in the past and, if it did, to determine whether such work has since stopped. – Reuters