Terror group Islamic State is employing scientists and weapons experts to train jihadists to carry out sophisticated “spectacular” attacks in Europe, while also modifying weapons systems capable of targeting passenger jets and military aircraft.

From a “jihadi university” in the Syrian city of Raqqa, the scientists have stunned western weapons experts by producing a homemade thermal battery for surface-to-air missiles.

It had been regarded as a virtually impossible feat for terror groups working without a military infrastructure.

But footage exclusively obtained by Sky News shows that IS can now recommission thousands of missiles assumed by western governments to have been redundant through old age. […]