Prior to the deportation of individuals of Jewish background to the concentration camps there were at least 2,173 Jews in Norway. During the Nazi occupation of Norway 772 of these were arrested, detained, and/or deported, most of them sent to Auschwitz. 742 were murdered in the camps, 23 died as a result of extrajudicial execution, murder, and suicide during the war. Between 28 and 34 of those deported survived their continued imprisonment (following their deportation). The Norwegian police and German authorities kept records of these victims, and so, researchers were able to compile information about the deportees.