The result of the talks between the six countries -- China, Britain, France, Russia, the US and Germany -- would be formally announced soon, the news agency quoted European Union (EU) spokesman as saying.

Iran's chief negotiator Mohammad Javad Zarif met his German, French and British counterparts. Under the deal, Tehran would have the right to challenge UN request and an arbitration board composed of Iran and the six world powers that negotiated with it would have to decide on the issue.

Still, such an arrangement would be a notable departure from assertions by top Iranian officials that their country would never allow UN's International Atomic Energy Agency into such sites. Iran has argued that such visits by the IAEA would be a cover for spying on its military secrets.

This morning, the European Union announced that the final plenary of Iran and the six countries negotiating with it will take place at 10.30 Vienna time, followed by a news conference. A Western diplomat said they will endorse the deal, reached in the early morning hours. He demanded anonymity because he was not authorized to  comment on the confidential talks.

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