 In September 1941 deportations of Jews began, with most Bosnian Jews being deported to Auschwitz (many first to Kruščica concentration camp) or to concentration camps in Croatia.The Ustaše set up concentration camps at Kerestinac, Jadovna, Metajna and Slana.The most notorious, where cruelty of unimaginable proportions was perpetrated against Jewish and Serbian prisoners were at Pag and Jasenovac.