"Selbstschutz" set up locations for massacres of interned Poles. At times, they were organized in places where the Wehrmacht and "Ordnungspolizei" already established concentration camps. There were 19 such locations recorded in the following Polish cities: Bydgoszcz (see Bromberg-Ost), Brodnica (renamed "Strasburg"), Chełmno (see Chełmno extermination camp), Dorposz Szlachecki, Kamień Krajeński, Karolewo, Lipno (renamed Lippe), Łobżenica, Nakło (Nakel), Nowy Wiec near Skarszew, Nowe on the Vistula, Piastoszyn, Płutowo, Sępólno Krajeńskie, Solec Kujawski (Schulitz), Tuchola (Tuchel), Wąbrzeźno (Briesen), Wolental near Skórcz, and Wyrzysk (Wirsitz). The majority of the arrested Poles – men, women and youth – were murdered on the spot by the "Selbstschutz" executioners.