"During the expert-level and technical talks, various proposals and initiatives are put forward by the negotiators and they are discussed by the sides, but no proposal has been agreed upon by all parties so far," Afkham said in New York on Monday in response to a question regarding a Western proposal of disconnecting Iran's centrifuges from the feeding sources.

Western Media reported recently that Iran and the world powers were working on a new proposal by the West based on which Iran would be allowed to have more uranium enrichment centrifuges but would be disconnected from the feeds of uranium.  

Iranian nuclear negotiators have not made any public comments on the reported proposal so far.  

Fresh round of talks between Iran and the P5+1 group -- Britain, China, France, Russia, and US plus Germany - started on Friday in New York.

The talks are expected to last until September 26.

In July, Iran and the six countries agreed to extend negotiations over Iran's controversial nuclear programme for four more months till November 24 as they could not narrow down the significant gaps on core issues during the past six months.

An interim deal, which took effect January 20, was designed to buy time for negotiations.

Under the deal, Iran would suspend some sensitive nuclear activities in exchange for a limited sanctions relief.

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