Tehran - Iran has started to install 6,000 new centrifuges at the Natanz nuclear plant in central Iran, the news network Khabar quoted President Mahmoud Ahmadinejad as saying Tuesday.

"Today the installation of 6,000 new centrifuges in Natanz has started and there have been other new nuclear developments which will be disclosed later today (Tuesday)," Ahmadinejad said.

On the occasion of the so-called "National Day of Nuclear Achievement," Ahmadinejad visited the Natanz site earlier Tuesday.

Iran will also hold a special ceremony on Tuesday evening in Tehran to commemorate the occasion and disclose further details on new nuclear achievements. (dpa)