Senior officials from the United States, Russia, China, Britain, France, as well as Germany will have a "private meeting," a spokesman for British Foreign Office told Xinhua, adding that there is "no news conference and news briefing" after the meeting.

The spokesman said the meeting would start at mid-morning and last to late afternoon, but he gave no further details.

The meeting was postponed last Friday for "more detailed preparations on the EU-3 proposals" to Iran.

Last week, the EU was prepared to offer a cooperation deal, in order to find a diplomatic solution to Iran's nuclear issue. The deal is likely to include an offer of a light-water reactor and an assured supply of nuclear fuel for civilian atomic plants so Iran would not enrich uranium itself.

But Iranian President Mahmoud Ahmadinejad said Iran would reject a deal with the EU which plans to offer incentives in exchange for Iran's halting uranium enrichment.