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The Parchin complex has been often mentioned in the West as a suspected base for secret nuclear experiments — a claim Iran consistently denies. IAEA inspectors visited the site in 2005, but only one of four areas on the grounds, reporting no unusual activities.

Last year, IAEA’s report said there were indications Tehran has conducted high-explosives testing to set off a nuclear charge at Parchin. Iran denied the atomic activity and insisted that any decision to open the site rests with the armed forces.

“We have our credible information that indicates that Iran engaged in activities relevant to the development of nuclear explosive devices,” Amano said told reporters Monday outside a 35-nation IAEA board meeting in Vienna, describing his sources as “old information and new information.”

Tehran has dismissed the charge, saying it was based on “fabricated documents” provided by a “few arrogant countries,” a phrase Iranian authorities often use to refer to the U.S. and its allies.


Associated Press writers George Jahn in Vienna, David Rising in Berlin and Raf Casert in Brussels contributed to this report.