Iran is transferring centrifuges from its Natanz nuclear facility to bunkers in the Fordow nuclear enrichment plant in the North, Fereydoun Abbasi-Divani said. "Transferring the centrifuges of the Natanz site to Fordow is underway with full observance of standards," Abbasi-Divani, head of the country's Atomic Energy Organization said. He said a number of centrifuges have already reached the Fordow plant, the country's second largest enrichment site located near the northern city of Qom. In June he said plans to transfer 20 percent of the country's uranium enrichment to the Fordow plant. Since Iran raised the level of enrichment to 20 percent last year ,it has produced 56.7 kilograms, about half the amount needed for a weapon. The Iranian Foreign Minister Ali Akbar Salehi said the International Atomic Energy Agency was informed of the transfer of nuclear activities to the Fordow plant.