Every incremental increase brings Iran closer to the day when it could produce a nuclear weapon, should it make the political decision to do so. They're not there yet, this is an incremental increase... But it would certainly be seen as concerning in Israel and parts of the US.
– Mark Fitzpatrick. International Institute for Strategic Studies
Iran's supreme leader says the country will not abandon its "peaceful" atomic program. The United States and its allies suspect Iran is trying to develop nuclear weapons, a charge Tehran denies.
I declare that the Islamic Republic of Iran has never been after nuclear weapons and it will never abandon its right for peaceful use of nuclear energy. Nuclear arms have neither provided security nor boosted political power.
– Ayatollah Ali Khamenei
Ayatollah Ali Khamenei has the final say on all state matters in Iran.
The UN's nuclear watchdog says Iran is preparing for a possible major expansion of uranium enrichment in an underground complex.
The Fordow site is buried deep inside a mountain
The number of enrichment centrifuges there has more than doubled to 2,140 from 1,064 in May
However, the new machines are not yet operating
The International Atomic Energy Agency also says "extensive activities" at Iran's Parchin military complex will hamper its investigation of possible past nuclear weapons development work there - if inspectors are granted access.