After the invasion in May 1940, several camps were also built in the Netherlands: in Amersfoort, Vught, Ommen, Schoorl, and Westerbork. The latter is most known: Jews who were caught were transported to this camp. From 1 July, 1942, train transports left from Westerbork to ‘the East'. More than 100,000 men, women, and children were transported in this way to one of the nazi extermination camps in Poland (Auschwitz and Sobibor). Not only Jews, but also 245 Dutch Sinti and Roma were deported via Westerbork to Auschwitz. The other camps in the Netherlands were used as prison or labour camps.