VIENNA - The UN nuclear watchdog has received an explanation from Iran about the development of detonators that can help set off an atomic explosive device, and has asked for further clarification, diplomatic sources said on Friday.

How Iran responds to the UN agency's questions about so-called Exploding Bridge Wire (EBW) detonators is seen as an important test of its willingness to cooperate fully with a long-stalled probe into suspected atomic bomb research.

Iran says allegations of such activity are baseless, but has offered to help clear up the issues with the International Atomic Energy Agency (IAEA), a Vienna-based UN body

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