The United Nations nuclear watchdog chief Rafael Grossi has arrived in Tehran today for discussions with Iranian officials following the detection of extremely high level enriched uranium in the country.  

The visit by the head of the International Atomic Energy Agency comes with the Vienna-based organisation seeking to get Iran to increase cooperation over its nuclear activities.

He will meet the head of Iranian Atomic Energy Organization  Mohammad Eslami.       

A confidential IAEA report says uranium particles were enriched up to 83.7 percent in Iran just under the 90 percent threshed needed to produce an atomic bomb.