
The fifth round of talks was held between Zarif, Kerry and Ashton on Sunday.
Speaking on the condition of anonymity, the source said it was a good meeting but there are a lot to be done and it is too soon to make any judgment on the outcome.
The two sides are trying to reach a comprehensive agreement by November 24.
Meanwhile, Iran rejected the speculation made by Western media that the negotiating parties are willing to extend the deadline.
By IRNA
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