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The deputy head of the UN nuclear agency has arrived in Tehran for talks on Iran's disputed nuclear programme.

Six world powers agreed to consider further sanctions against Iran during discussions on Wednesday.

This week Iran missed a deadline to reply to an offer of incentives to end its uranium enrichment programme, which could be used in arms manufacture.

France, the US and UK are pushing for new sanctions, but Russia says there is potential for more dialogue.

Correspondents say it is not clear that the visit of Oli Heinonen, the International Atomic Energy Agency's deputy head, is directly related to the incentives offer.