Via Google translation:
The databases of several major websites are stolen by criminals after a Proserve internet server was hacked.
In total, data from approximately 800,000 persons have been stolen.
These large databases, including Q-Music, Stedin, the Telegraaf Media Groep café, and various online stores such as Pleinshoppen, Internetbikes en Brekelmans Modelbouw.
Read more on nu.nl, while I try to find some English language coverage of the incident.
h/t, @FBorgesius