Head of the Atomic Energy Organization of Iran (AEOI) Ali Akbar Salehi says Iran has yet to receive an official response from the Vienna group regarding nuclear fuel swap negotiations, Press TV reported.
"So far we have not received an official and written response; however, we have heard through the media that the US, France and Russia have expressed their readiness [for negotiations]," Mehr News agency quoted Salehi as saying on Friday.
The Vienna group -- the US, Russia, France and the International Atomic Energy Agency (IAEA) -- was formed to negotiate over a proposed swap deal to provide fuel for the Tehran nuclear reactor.
Iran's Ambassador to the IAEA Ali Asghar Soltanieh delivered Tehran's official response to Western queries about the Tehran fuel swap declaration on July 26.