The International Atomic Energy Agency (IAEA) believes Iran conducted explosives tests with possible nuclear applications at Parchin, a sprawling military base southeast of Tehran, and has repeatedly asked to inspect it.

Western diplomats say Iran has carried out extensive work at Parchin over the past year to cleanse it of any evidence of illicit activities but IAEA chief Yukiya Amano said earlier this month a visit would still be “useful”.

“If the trans-regional threats (against Iran) dissipate, then they will find it possible to visit Parchin,” Deputy Foreign Minister Hassan Qashqavi was quoted by the Iranian Labour News Agency as saying on Wednesday. The comments were also published on Thursday by online magazine Iran Diplomacy.