In just over one and a half year - from May 1942 to November 1943 - tens of thousands of people were murdered in Sobibor. Sobibor was a small town in the province of Lublin in the eastern part of Poland, situated on the Chelm-Wlodawa railway line. A few kilometres from the town, the SS built an extermination camp by the same name. Sobibor, together with Belzec and Treblinka, was one of the three Aktion Reinhard camps. The name refers to Reinhard Heydrich, head of the Reichsicherheitshauptamt (Reich Security Head Office), who was killed in June 1942 in Prague by two Czech soldiers dispatched from England for that purpose. The Aktion Reinhard camps were built quickly after the Wannsee Conference in January 1942. During this conference, under the leadership of Heydrich, the Nazis decided to murder the entire European Jewry. Sobibor was the smallest of the three camps; nearly 870,000 people were murdered in Treblinka, in Belzec more than 600,000, and in Sobibor 170,000 to 190,000. Between March and June 1943, in 19 transports, 34,313 Dutch Jews were deported to Sobibor. Only 18 survived.