The International Atomic Energy Agency (IAEA) verified on Tuesday that Iran fed uranium hexafluoride feedstock enriched to up to 5% into a cascade, or cluster, of 166 IR-6 centrifuges at Fordow to enrich it further to up to 20%, the IAEA said in a statement. An IAEA report last month said Iran was operating 166 IR-6 machines there without keeping the enriched product.