VIENNA - The UN nuclear watchdog sought in talks with Iran on Tuesday to advance a long-stalled investigation into Tehran's atomic activities, but it was not immediately clear whether any headway was made.

A spokeswoman for the International Atomic Energy Agency confirmed the two sides met in Tehran, but said the IAEA was not planning to issue a statement about the talks on Tuesday, leaving open the possibility one might be made later.

Diplomatic sources had said the Vienna-based UN agency and Iran were expected to discuss IAEA requests for information about detonators that can, among other things, be used to set of a nuclear explosive device.

It could have provided an opportunity for progress on a key issue ahead of a quarterly IAEA report on Iran's nuclear program, due this week, which will be debated by the U.N. agency's 35-nation governing board at a meeting in early June.


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