Iran's President Mahmoud Ahmadinejad speaks during a ceremony at the Natanz nuclear enrichment facility, 350 km (217 miles) south of Tehran, April 9, 2007. Iran is testing an advanced centrifuge at its Natanz nuclear complex, diplomats said on Wednesday, a move that could lead to Tehran enriching uranium much faster and gaining ability to build atom bombs. REUTERS/Caren Firouz