The head of the UN nuclear watchdog said Monday there was “no indication of a physical attack” on an underground section of Iran’s Natanz uranium enrichment site following Israeli strikes that destroyed the plant’s above-ground part.

The International Atomic Energy Agency (IAEA) has said that a key above-ground component of the Natanz site, where Iran was producing uranium enriched to up to 60pc short of the 90pc required to produce weapons-grade material, had been destroyed in the attacks.

Addressing an extraordinary board meeting on Monday, IAEA chief Rafael Grossi said there has been “no additional damage” at the Natanz site since Friday.

Radioactivity levels outside the Natanz plant “remained unchanged and at normal levels, indicating no external radiological impact”, Grossi added.