Located about 200 miles south of Tehran, the nuclear facility at Natanz (shown here in 2005) has fed concerns that Iran is seeking to produce nuclear weapons. The International Atomic Energy Agency says Iran is enriching uranium at Natanz and as has already produced enough nuclear fuel for a single nuclear bomb, provided Iran develops the capability to enrich the material further to weapons grade. Henghameh Fahimi/AFP/Getty Images hide caption

itoggle caption Henghameh Fahimi/AFP/Getty Images