The nuclear accord puts strong limits on Iran's uranium enrichment program in return for an easing of some international sanctions on Tehran for six months while a permanent deal is negotiated.
The United States and its allies believe Iran's nuclear program is aimed at producing a nuclear weapon, a claim that Tehran denies, saying it is intended only for peaceful purposes.
The past month, experts from Iran and the so-called "5+1" countries the US, Britain, France, Russia, China and Germany have held several rounds of talks in Geneva to work out details on carrying out the agreement. The most recent session was yesterday.
State television also quoted senior Iranian nuclear negotiator Abbas Araghchi as saying he may meet again with Helga Schmid, a senior European Union negotiator, next week. The Europeans said there had been progress, but some points still needed to be finalised, without elaborating.
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Michael Mann, spokesman for EU High Representative Catherine Ashton, said the experts would now report back to their home governments and contacts would continue "to finalise a common understanding of implementation."
A US State Department official said there has been progress in the talks and the teams have taken "a few outstanding points" back to their governments for consultation. "The two sides expect to finalise the implementation plan soon," the official said.