Here's hope the BND was actually involved.
And still isbut the DGSE has dipped it's beak into the blacker side of things on occasion.
However "Homo" operations (codename for Human targettings) are not supposed to be common
Well i am pretty splitted over the issue. To carry targetted assasinations, you need a serious Humint. I am not sure that for european agencies if it is really worthy to put in danger some intel grids (already painfuly harmed by the green revolution crack down) in order to kill an handful of scientists
Bribery and money could be as efficient
The German agents would most probably only provide the exact whereabouts and information for the killing to "interested People", and than lean back watching them beeing eaten by the many others sharks in the pond
The same Way they guided bombs in Baghdad during the start of the Iraq War. (officially only helping with "information", so that hospitals and stuff would NOT be hit. Yeah sure. ^^ )
The Israeli's think this programme is an existential threat then they'll do what they believe is needed to stop it...just like Iran supplies her proxies to wage war on Israel.