The UN nuclear watchdog says it is "increasingly concerned" that Iran is secretly working on components for a nuclear weapons programme.Sleep tight.
The International Atomic Energy Agency (IAEA) describes its information as "extensive and comprehensive".
In a report seen by news agencies, it also says Tehran is preparing to enrich uranium at a new location - an underground bunker near Qom.
The IAEA says "many member states" had provided evidence for its latest assessment on Iran's nuclear ambitions.
Extracts of the report, published by the AFP news agency, said the IAEA was "increasingly concerned about the possible existence in Iran of past or current undisclosed nuclear related activities involving military related organisations".
These included "activities related to the development of a nuclear payload for a missile".
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