Iran says it does not want such arms, and agreed yesterday to answer some questions on suspicions that it worked on a detonator that could set off a nuclear charge.
But senior inspector Terjo Varjoranta said Tehran's concession was only "the first step," with many issues remaining.
Varjoranta's International Atomic Energy Agency raised concerns about detonator development three years ago. Back then, the agency said such technology had "limited civilian and conventional military applications" and was a matter of concern "given their possible application in a nuclear explosive device."
While uranium enrichment is not directly linked to the IAEA's weapons probe, any hidden enrichment work would worry the United States and its allies. Iran says it is enriching only to make reactor fuel.
Washington and five other world powers are meeting February 18 with Iran in Vienna as they work to turn a first-step agreement into a pact that permanently curbs Iran's uranium enrichment in exchange for ending sanctions on the Islamic Republic.
Both sides say those talks are off to a promising start. But the US and its allies are looking to the IAEA-Iran meetings for additional signals that Iran is serious in wanting to ease tensions over its nuclear program.
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