Improvised Explosives Devices (IED) have long been, and remain, the weapon of choice for terrorists and insurgents due to the ease of their manufacture, employment, and destructive potential, as shown by the attacks that have occurred around the world in the past few months.
Driving the increased threat is the amount of terrorist propaganda material available on the internet and on the social media, which include instructions and “recipes” to manufacture IEDs and provide tactical advice on how to deploy them.
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Source: European Eye on Radicalisation