It is time to tackle "more difficult" nuclear issues with Iran such as allegations of past weapons work, IAEA chief Yukiya Amano told AFP on Friday.

"We started with measures that are practical and easy to implement, and then we move on to more difficult things," the UN atomic watchdog head said.

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"We certainly wish to include issues with 'possible military dimensions' in future steps ... We have already discussed it and will continue to discuss it at the next meeting," he added.

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