The Nazis opened the camp in the town of Dzialdowo immediately after the German invasion of Poland, in September 1939. They used it throughout the war as a transit and extermination camp for Jews, political opponents and members of the Polish elite. It is estimated that about 30,000 people have been killed. According to the researchers, the victims in the grave were murdered as early as 1939. In 1944, when the Russian army advanced into Poland, the camp authorities tried to erase the traces of their crimes. They ordered Jewish prisoners to exhume and burn the bodies. The ashes were...