"In light of ongoing acts of aggression by the US and Israeli regimes... (Iran) called for an urgent extraordinary meeting" of the International Atomic Energy Agency's board of governors, Iran's mission to the Vienna-based agency said on X.

The post included an image of its formal request letter, addressed to IAEA chief Rafael Grossi.

"Baseless claims, vicious threats and wrongful acts of aggressors against Iran's peaceful nuclear program shall be addressed by the Board immediately," it added.

Grossi took part in the US-Iranian talks on February 17 and 26, which some observers saw as the last chances to avoid a conflict.

The UN nuclear watchdog stressed on Friday the "utmost urgency" of its request to verify all nuclear material in Iran, according to a confidential report seen by AFP.

Western countries led by the US and Israel, Iran's arch-enemy and considered by experts to be the only nuclear power in the Middle East, accuse the Islamic republic of seeking to acquire nuclear weapons.

Tehran denies having such military ambitions, but insists on its right to this technology for civilian purposes.