WATCH: ISIS Weapons Lab Capable of Creating Surface-to-air Missiles

A training video meant to show ISIS supporters in Europe how to build different types of explosives, smuggled out of Raqqa by an ISIS defector and obtained by Sky News, has been described as an intelligence 'gold mine.'

Sky News

ISIS defector to Sky News: 

"Videoing and documenting this training programme was meant for Europe to cause huge damage.

If it was meant internally (inside Syria) they could send someone to set an explosive device or wire a car as they are able to do this (openly).

But doing such a programme and documenting it was meant to target a large number of people and in more than one location, of course it wasn't meant either for Syria or Iraq."