The International Atomic Energy Agency (IAEA) is participating in talks on a final agreement between the United States and Iran on Iran's nuclear programme, IAEA head Rafael Grossi said in Geneva on Thursday.
He said that the issues to be settled included which sites in Iran the IAEA inspectors would be permitted to visit and inspect.
Grossi told a press conference that work remained to be done, with further talks set to start in Switzerland on Friday following the signing of the initial framework agreement.
The time had now arrived to set out further specific steps with US and Iranian representatives, Grossi said. He declined to go into detail ahead of these technical negotiations.
Following weeks of negotiations, the United States and Iran have signed a framework agreement to end the war. In it, Iran repeated its long-stated position not to produce a nuclear weapon.
The agreement includes as a minimum the downgrading under IAEA supervision of Iran's highly enriched uranium that is almost weapons grade.
Iran has also undertaken not to make changes to its nuclear programme while a final agreement is worked out.
Grossi did not say whether the IAEA would conduct on-site checks in Iran during the negotiation phase on whether Tehran was sticking to the status quo by not repairing nuclear facilities damaged during the war.
The Argentine diplomat, who is seeking to become the next UN secretary-general, said he did not wish to anticipate these talks.
