Experts claim western defectors to ISIS with experience in engineering have managed to successfully create the devastating weapon - which could bring down an aircraft.
Aviation Security Expert Julian Bray cautions: "Although the images and the documentary constructed by Sky News are compelling, further verification needs to be undertaken over the acquisition and source of the video, it could after all be an elaborate hoax, set up by ISIS to cause needless panic and alarm to all who view the footage. There is also the matter of delivery and guidance systems. Surface to air missiles and missiles also need launchers, something we sincerely hope is still beyond the scope of the UK based 'bedroom jihadi.'
An IS trainer with more than eight hours of unedited training videos was captured by the remnants of the Free Syrian Army (FSA) as he headed north towards Turkey and was believed to heading for Europe.
Sir Michael was speaking to Sky News about footage that reportedly shows the terrorist group are now able to produce the thermal batteries needed for such weapons.
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