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    REFILE-IAEA shows diplomats images of suspected Iran nuclear clean-up

    * IAEA shows Parchin images at briefing for diplomats

    * West suspects Iran clean-up of illicit nuclear-linked

    activity

    * Iran dismisses allegations, says must get documents from

    IAEA

    VIENNA, Sep 5 (Reuters) - The U.N. nuclear watchdog showed a

    series of satellite images on Wednesday that added to suspicions

    of clean-up activity at an Iranian military site it wants to

    inspect, Western diplomats said, but Tehran's envoy dismissed

    the presentation.

    The pictures, displayed during a closed-door briefing for

    member states of the International Atomic Energy Agency (IAEA),

    indicated determined efforts in recent months to remove any

    incriminating evidence at the Parchin site, the diplomats said.

    In the latest picture, from mid-August, a building where the

    IAEA believes Iran carried out explosives tests - possibly a

    decade ago - relevant for nuclear weapons development had been

    shrouded in what appeared to be pink tarpaulin, they said.

    "It was pretty compelling," a senior Western diplomat said

    about the briefing by IAEA Deputy Director General Herman

    Nackaerts and Assistant Director General Rafael Grossi.

    "The last image was very clear. You could see the pink," the

    envoy said.

    The purpose of covering the building could be to conceal

    further clean-up work from overhead satellites, according to a

    U.S. think-tank, the Institute for Science and International

    Security (ISIS).

    The IAEA said in a confidential report last week that

    "extensive activities" undertaken at Parchin since February -

    including the demolition of some buildings and removal of earth

    - would significantly hamper its investigation there, if and

    when it was allowed access to the facility southeast of Tehran.

    Iran, which denies Western accusations that it seeking to

    develop the capability to make nuclear bombs, says Parchin is a

    conventional military site.

    Iran's envoy to the IAEA, Ali Asghar Soltanieh, suggested

    the activities "claimed to be made in the vicinity of these

    so-called locations which are identified" by the IAEA had

    nothing to do with the U.N. agency's investigation.

    "Merely having a photo from up there, a satellite imagery

    ... this is not the way the agency should do its professional

    job," he told reporters after the IAEA's briefing.

    GIVE US THE DOCUMENTS, IRAN SAYS

    "Everybody should be careful not to damage (the) credibility

    of the agency," Soltanieh added.

    Iran says it must first reach a broader agreement with the

    IAEA on how the Vienna-based U.N. agency should conduct its

    investigation into alleged nuclear bomb research in the Islamic

    state before it can possibly be allowed access to Parchin.

    Last week's IAEA report said "no concrete results" had been

    reached in a series of high-level meetings with Iran over the

    past eight months on such a framework accord.

    Highlighting one of the main sticking points, Soltanieh said

    Iran must see the documents which form the basis for the IAEA's

    concerns of possible military dimensions to the Islamic

    Republic's nuclear programme.

    Diplomats say the IAEA is not able to hand over some of

    those files - which it is believed to have received from foreign

    intelligence services - because of confidentiality reasons.

    "They have to deliver the documents," Soltanieh said, making

    clear that Iran could not otherwise agree to a deal. "Without

    documents we cannot prove whether this is baseless or not

    baseless. We should have the documents."

    The IAEA report also said Iran had doubled the number of

    centrifuges at an underground uranium enrichment facility in the

    last few months, in defiance of international demands that it

    suspends the work.

    Refined uranium can be used to fuel nuclear power plants,

    which is Iran's stated aim, or provide the explosive core for a

    nuclear warhead if processed further, which the West and Israel

    suspect is Tehran's ultimate aim.