HONOLULU - US Secretary of State Hillary Clinton said on Friday that Iran must respond soon to "serious concerns" raised by the UN nuclear watchdog's report that Tehran appeared to be working on nuclear bomb technology.

"In the coming days, we expect Iran to answer the serious questions raised by this report," Clinton told reporters after ministerial talks at an Asia-Pacific summit in Honolulu.

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The UN nuclear watchdog showed letters and satellite images on Friday as part of evidence pointing to military dimensions to Iran's atomic activities, diplomats said, but Tehran's envoy dismissed it as "lousy" intelligence work.

Herman Nackaerts, head of nuclear inspections worldwide at the International Atomic Energy Agency, made an hour-long technical presentation of the IAEA's latest report on Iran's nuclear program at a closer-door meeting for member states.

The hotly anticipated document, released last Tuesday, said Iran appeared to have worked on designing an atomic bomb and that secret research may continue. It was the most detailed IAEA report to date on the issue.

In Honolulu, Clinton also repeated Washington's call for Syrian President Bashar Assad to step down and end his violent crackdown on protesters.

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