Foreign Minister Mohammad Javad Zarif is to lead Iran's nuclear team at a new round of negotiations with the so-called P5+1 group of the US, Britain, France, China and Russia plus Germany on October 15 and 16.
But Zarif "will attend only the opening session on Tuesday and the rest of the talks will be held between deputies if the six (world powers) are not represented at the level of foreign ministers," the official news agency IRNA said, quoting a source in Iran's nuclear team.
Zarif will remain in the Swiss city for the duration of the talks, it added.
According to the report, Zarif and European Union foreign policy chief Catherine Ashton -- who represents the P5+1 in the talks -- will meet on Monday evening at a dinner.
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This will be the first round of negotiations since moderate Hassan Rouhani took office as Iran's president in August with a pledge to engage the world constructively and resolve the decade-long showdown over Tehran's nuclear ambitions.
Western countries, along with Israel, suspect Iran's nuclear activities are aimed at military objectives, a claim Tehran vehemently denies.