Just to add -- last I remember researching this, none of the terrorists attacks in Europe in the last two decades that were coordinated (and we know how), were coordinated using secure communications. Bataclan was planned over SMS, for instance.
Based German PP.
So... Everything, everywhere, all at once? Establish an expert group to figure out how immovable objects are to be met with unstoppable forces. And mandate the findings.
JFC