Thanks Matti for the quick and detailled answer
I agree with you that Wietersheim is the probable crash location. Minden is not a so big city to be used as a reference for a crash occuring 60 km away, but 6 km is close enough, and Wietersheim is just at the right place.
Wietersheim is in the area covered by the website
http://www.spurensuche-owl.de so I have contacter the web administrator through the website to ask if he can confirm this or not.