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Drawing seen as evidence of Iranian nuclear arms testing; Based on information from military site

A drawing based on information from inside an Iranian military site shows an explosives containment chamber of the type needed for nuclear arms-related tests that U.N. inspectors suspect Tehran has conducted there. Iran denies such testing and has neither confirmed nor denied the existence of such a chamber.

The computer-generated drawing was provided to the Associated Press by an official of a country tracking Iran's nuclear program who said it proves the structure exists, despite Tehran's refusal to acknowledge it.

That official said the image is based on information from a person who had seen the chamber at the Parchin military site, adding that going into detail would endanger the life of that informant. The official comes from an IAEA member country that is severely critical of Iran's assertions that its nuclear activities are peaceful and asserts they are a springboard for making atomic arms.

A former senior IAEA official said he believes the drawing is accurate. Olli Heinonen, until last year the U.N. nuclear agency's deputy director general in charge of the Iran file, said it was "very similar" to a photo he recently saw that he believes to be the pressure chamber the IAEA suspects is at Parchin.

He said even the colors of the computer-generated drawing matched that of the photo he had but declined to go into the origins of the photo to protect his source.

Beyond IAEA hopes of progress, that two-day meeting is being closely watched by six powers trying to persuade Iran to make nuclear concessions aimed at reducing fears that it may want to develop atomic arms as a mood-setter for May 23 talks between the six and Tehran in Baghdad.

Warnings by Israel that it may attack Iran's nuclear facilities eased after Iran and the six -- the United States, Russia, China, Britain, France and Germany -- met last month and agreed there was enough common will for the Baghdad round. But with Israel saying it is determined to stop Iran before it develops the capacity to build nuclear weapons, failure at the Iraq talks could turn such threats into reality.

In Tehran on Sunday, Saeed Jalili, Iran's top nuclear negotiator, said it was up to the Western nations coming to the Baghdad talks to "build trust of the Iranian nation," adding, "Any kind of miscalculation by the West will block success of the talks."

The IAEA has been stonewalled by Iran for more than four years in attempts to probe what it says is intelligence from member states strongly suggesting that Iran secretly worked on developing nuclear weapons.

The senior diplomat familiar with the IAEA investigations said the Iranians have refused to comment "one way or the other" on that issue to agency experts. He and others interviewed by the AP demanded anonymity because their information was privileged, and the official providing the drawing and other details on the structure also demanded that he and his country not be identified in return for sharing classified intelligence.

Attempts to get Iranian comment were unsuccessful. A copy of the diagram was attached to an email sent to Ali Asghar Soltanieh, Iran's chief delegate to the IAEA, with a note that the AP would be asking for reaction. Subsequent phone calls over the weekend went to his voice mail.