After the joint German-Soviet invasion of Poland, which started World War II, the town was occupied by Germany from 1939 to 1945, administratively included in the Radom District of the General Government (German-occupied central Poland). As part of the "AB-Aktion", in June 1940, the Germans carried out mass arrests of Poles, who were afterwards imprisoned and tortured in Skarżysko-Kamienna and then murdered in a forest near Skarżysko-Kamienna. The Polish resistance movement was active in the town.