Iran’s heavy water nuclear reactor at the Arak facility. (Photo: AFP/ VNA)

Ali Akbar Salehi said on Sunday that Iran was moving to restart activity at the heavy water nuclear reactor at the Arak facility.

The claim, if confirmed, would suggest that Iran has produced far more enriched uranium than was previously known and that it has exceeded the deal’s limit many times over.

Salehi’s remarks came ahead of a meeting between Iran and the other remaining parties to the Joint Comprehensive Plan of Action - Britain, France, Germany, China, and Russia - in Geneva to seek ways to save the nuclear deal.

Iranian President Hassan Rouhani said that if the powers remaining in the nuclear agreement did not make concessions to Iran in 60 days, Tehran would continue to make more substantial breaches.