Plans for the talks -- between the so-called EU-3 of Britain, France and Germany and EU policy chief Javier Solana, and Iran's top nuclear negotiators -- are now pencilled in for Wednesday in Geneva, said the source.

"We are planning now on Geneva on Wednesday, but it is not confirmed," he said, requesting anonymity. Earlier this week diplomats had said the talks would take place in Brussels on Tuesday.

The source said it was difficult to forecast until Monday, when EU foreign ministers are due to meet in Brussels for regular talks. The fact that Iran is on holiday Friday also made it difficult to be precise about plans, he said.

"It will all become clear on Monday, when we will have the ministers in," he said.

The EU called for the talks after a series of statements from Tehran indicating that Iran is set to resume nuclear enrichment activities, in breach of a November agreement which paved the way for the talks.

The Europeans have made it clear that if Iran breaches the accord it could refer to the issue to the UN Security Council -- a move long pressed for by the United States which believes Iran is working to build a nuclear bomb.

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