After the German–Soviet war began, the Nazis decided to undertake the European-wide Final Solution to the Jewish Question. In January 1942, during a secret meeting of German leaders chaired by Reinhard Heydrich, Operation Reinhard was drafted; soon to become a major step in the systematic murder of the Jews in occupied Europe, beginning in the General Government district of German-occupied Poland. Within months, three top-secret camps (at Bełżec, Sobibór, and Treblinka) were built to efficiently kill tens of thousands of Jews every day. These camps differed from Auschwitz and Majdanek, because the latter operated as forced-labour camps initially, before they became death camps fitted with crematoria. Unlike "mixed" extermination camps, the extermination camps of Operation Reinhard kept no prisoners, except as a means of furthering the camps' sole purpose of industrial scale murder. Very few Jews successfully escaped death (notably, only two at Bełżec). All other victims were killed on arrival.