Simon Smith, Britain's ambassador to the IAEA, said 
    material presented to the IAEA in Vienna came from multiple
    sources and included designs for a nuclear warhead, plus 
    information on how it would perform and how it would fit 
    onto a missile.

    The material suggested there was "detailed work put into 
    the designing of the warhead, studying how that warhead 
    would perform, how it would be detonated and how it would 
    be fitted to a Shahab-3 missile".

    Another diplomat said an Iranian video depicted mock-ups of
    a missile re-entry vehicle. An IAEA director suggested the 
    component - which brings missiles back from the stratosphere
    - was configured in a way that strongly suggests it was 
    meant to carry a nuclear warhead.