11,000 centrifuges operational in Iran: Ahmadinejad

In February Iran announced that it has started using new generation of domestically made centrifuges that enrich uranium at a faster pace.

Centrifuges are machines that spin at supersonic speed to raise the concentration of the fissile isotope of uranium.

As a signatory to the nuclear non-proliferation regime (NPT) Iran is legally entitled to enrich uranium for civilian purposes.