Chief of International Atomic Energy Agency (IAEA) Rafael Grossi arrived at Mehrabad International Airport in Iran's Tehran on Friday for high-level meetings at the invitation of the Iranian government, IRNA reported.
He was then welcomed by Behrouz Kamalvandi, spokesperson for Iran's Atomic Energy Organization.
The visit comes amid discussions with Tehran on the origin of uranium particles enriched to up to 83.7-percent purity, very close to weapons grade, at its Fordow enrichment plant.