This is the status quo:
Though he was classified as a potential threat to public safety in February of 2016, authorities failed to collect evidence against Amri that would stand up in court.
Schuermann said they had “exhausted all legal powers to the limit to ward off potential dangers.” Despite seven separate investigations, the German authorities could not agree on whether the Tunisian would actually commit a terrorist attack.
Sounds a lot like Operation Gladio. They knew. They let it happen. They cry about red tape. At this late stage of the “terror wars” we’re to believe the entire police and intelligence apparatus of Europe is powerless.