The Nuclear Issue in Iran (25 images)

Iran's President Mahmoud Ahmadinejad (C) visits the Natanz uranium enrichment facilities 200 miles (322 km) south of the Tehran, Iran on April 8, 2008. President Mahmoud Ahmadinejad announced that Iran started installation of some 6,000 new centrifuges on Tuesday. (UPI Photo/President's official website)

An Iranian music group sings in front of a nuclear sign during a ceremony marking the third anniversary of National Day of Nuclear Technology at international services of the Islamic Republic of Iran Broadcasting (IRIB) conference center in Tehran, Iran on April 8, 2008. President Mahmoud Ahmadinejad announced that Iran started installation of some 6,000 new centrifuges on Tuesday. (UPI Photo/Mohammad Kheirkhah)

Iranian technicians work inside Fuel Manufacture Plant (FMP)'s building at Isfahan Uranium Conversion Facility (UCF) during a ceremony for Iran's national nuclear technology day just outside the city of Isfahan, 410 kilometers (255 miles) south of Tehran, Iran on April 9, 2009. (UPI Photo/Mohammad Kheirkhah)

Iranian technicians work inside Fuel Manufacturing Plant (FMP)'s building at Isfahan Uranium Conversion Facility (UCF) during a ceremony for Iran's national nuclear technology day just outside the city of Isfahan, 410 kilometers (255 miles) south of Tehran, Iran on April 9, 2009. (UPI Photo/Mohammad Kheirkhah)