A handout picture released by the official website of Iran's presidency office shows Iranian President Mahmoud Ahmadinejad visits Natanz uranium enrichment facilities some 300 kms, south of the capital Tehran on April 8, 2008. Iranian President Mahmoud Ahmadinejad annonced on Tuesday that Iran is starting work to install 6,000 new uranium-enriching centrifuges at its nuclear plant in Natanz. AFP PHOTO/HO/IRAN'S PRESIDENCY OFFICE WEBSITE --RESTRICTED EDITORIAL USE--