International Atomic Energy Agency Director Rafael Grossi arrived in Tehran on Saturday ahead of the deadline on which Tehran said it would suspend nuclear inspections by the UN nuclear watchdog.
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Grossi will meet Iranian nuclear officials including Ali Akbar Salehi, head of the country's nuclear department and a vice-president to President Hassan Rouhani.
Earlier on Saturday Salehi said he and Grossi will meet on Sunday to discuss the agency's "concerns" over the halt of the inspections as well as Iran's cooperation with the agency.
The International Atomic Energy Agency said Wednesday that the visit has aimed at finding "a mutually agreeable solution for the IAEA to continue essential verification activities in the country."
