Earlier quoted context omitted.
Of course it is. Raids can also be at witnesses' places if it is necessary to get the evidence. Otherwise I'd simply stow the bodies in my friends' cellars.
Help me understand as I am not living in Germany: Authorities can search and seize property of any civilian without a warrant if said civilian is just a witness? If yes, then who decides and how is it decided that someone is a witness? If for example I happen to stand in front of my window and witness a crime being committed in the street, they could search my house without any consent or warrant?
* https://www.ccc.de/en/updates/2018/hausdurchsuchungen-bei-ve...
* https://blog.torservers.net/20180704/coordinated-raids-of-zw...
The long and short of it is that there was a warrant, the question is whether the warrant itself was issued on a legitimate basis.