The director general of the International Atomic Energy Agency (IAEA), Rafael Grossi, said one area of particular concern is Iran's previously declared nuclear material, which includes 440 kg of highly enriched uranium, and that the issues have remained outstanding for more than five years, TRT World reported.

In a statement to the UN Security Council, Grossi said the Bushehr nuclear power plant is the one exception where agency inspectors are carrying out verification activities.