Mottaki gave no details about the venue for the talks. Western officials say they could take place in Vienna or Geneva.  

Talks between Iran and the five permanent members of the UN Security Council - the United States, Britain, France, Russia and China - plus Germany, will address concerns about Tehran's uranium enrichment, which was stalled in October last year, leading to a toughening of international sanctions. 

A spokesman for European Union Foreign Policy Chief Catherine Ashton said there was no official date set for nuclear talks with Iran. 

Iran, the world's fifth-largest oil producer, says it needs nuclear fuel-making technology to generate electricity. 

Iranian President Mahmoud Ahmadinejad has set conditions for further talks, saying a wider variety of countries must be involved, the parties must say whether they seek friendly or hostile toward Iran, and they must express a view on Israel's alleged nuclear arsenal.