The UN's nuclear watchdog said Sunday that some progress had been made in weekend talks in Tehran on Iran's nuclear programme and said the two sides aim to clarify all further open issues within the next four weeks, according to dpa. A statement by the International Atomic Energy Agency (IAEA) in Vienna said progress had been achieved regarding the agreed-on working plan regarding Iran's atomic activiites. The statement followed talks held Friday and Saturday in Iran by IAEA head Mohamed ElBaradei, who had met with President Mahmoud Ahmadinejad and Iran's supreme spiritual leader, Ayatollah Ali Khamenei.