Following their invasion of Norway, the Nazi regime and collaborationist Quisling government would establish over 600 concentration camps throughout the country. A handful were designated as "Polizeihäftlingslagers" (police detainee camps) and run by the "Sicherheitspolizei", specifically the camps at Grini, Falstad, Ulven (later replaced by Espeland), and Sydspissen (later replaced by Tromsdalen). Despite being built with the intention of holding political prisoners, these camps would also hold POWs, Jews, family members of the Norwegian resistance, and criminals with short sentences.