U.N. agency says Iran probe needs more work
Tero Varjoranta spoke to reporters a day after Iran agreed to start addressing suspicions that it may have worked on designing an atomic weapon, a potential breakthrough in a long-stalled investigation into Tehran's atomic activities.
Varjoranta said progress had been "good" but added: "There are still a lot of outstanding issues."
(Reporting by Fredrik Dahl, Editing by Michael Shields)