Iran's foreign minister said talks with world powers on the country's disputed nuclear programme, due to start in Geneva later on Saturday, were a positive step but that more meetings may be needed.

"We evaluate today's Geneva negotiations as positive and constructive," Manouchehr Mottaki told reporters in Tehran.

"Today's meeting might continue with several others so that the view points of all sides can be put on the table so that we reach ... agreement," he said.

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