Iran's leader says important and major nuclear achievements will be announced in the next few days.
President Mahmoud Ahmadinejad did not give any details, but insisted that Iran would never halt its programme to enrich uranium, which can be used to make a nuclear warhead, the BBC reports.
Mr Ahmadinejad was speaking at a rally in Tehran on Saturday as Iranians marked the 33rd anniversary of the Islamic revolution.
He said all the needs of the Iranian nation would be met by Iranian scientists in the near future and the world should witness great achievements in the nuclear sphere in a matter of days.
Mr Ahmadinejad promised that Iran would never yield to the West if it continued to use "the language of force and insult".
President Barack Obama said last week the United States would work with Israel to prevent Iran developing nuclear weapons.
Mr Obama said Israel's government was "rightly" very concerned about Iran's nuclear programme but he did not believe it had decided whether to launch a military strike.
Tehran insists its programme is entirely peaceful and refuses to negotiate over its uranium enrichment programme.
Talks between Iran and six world powers - the US, Britain, France, Germany, Russia and China - on the nuclear programme collapsed a year ago and show little sign of resuming, despite recent efforts to restart them by Turkey.
