This fits the pattern of sabotage all across Europe. The obvious candidate is Russia who are using hybrid warfare against Europe/UK for a long time. Why does this post have so many... strange comments, mostly from new accounts? More hybrid warfare?
It could also be any of the millions of people whose families we killed. No way to know, really.
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Now I wouldn’t call myself a student of European terrorism per-se, but haven’t virtually all of the countries listed had some form of domestic terror groups in the post WW2 era? Why am I not to believe this is domestic?