100 %, yes 100 % of all islamic terrorist where known to the police. 100 %.
But the police and politicians always want more and more surveillance.
Do they want to know 110 % of all terrorists?
http://www.spiegel.de/netzwelt/web/islamistischer-terror-in-europa-unsere-sicherheit-ist-eine-inszenierung-a-1150015.html

https://octodon.social/media/o_9Ye9rhZMp-Tebk8FQ