During World War II he remained in Warsaw and after the Warsaw Uprising of 1944 he was arrested by the Germans and deported to the Neuengamme concentration camp.
Arrested on 7 April 1944, he was deported to the concentration camp at Neuengamme, and Bergen-Belsen.
On March 1, fellow Norwegian but non-Jewish students had been sent by train from Buchenwald to Neuengamme as part of the White Buses operation, but these five were not allowed to leave on account of being Jewish.
He was sent further to many camps, first Lichterfelde, then Hamburg-Fuhlsbüttel, Neuengamme, Hamburg-Fühlsbuttel again, Königswartha, Bautzen, Leipzig and Eisenach.
Most of them were deported back to the Neuengamme camp, some were transported to Sandbostel camp Stalag X-B.
On 1 October and 2 October 1944, 661 men and boys, the majority of the male population, were deported from the town and 602 of them were sent to work in concentration camps such as Neuengamme and Birkenau.
His father died in 1943 in a Nazi concentration camp, Neuengamme.