The participation of the Hungarian occupying troops in the Nazi genocide in the Soviet territories lately has got into the focus of attention. A nation-wide debate has emerged in Hungary, and it shows that it could be rewarding to deepen the researches among the documents kept on the shelves of the Hungarian archives as well. This document is an account of an investigation by the Hungarian authorities after the war about the sequential mass murders. It reveals that despite the former statement of the literature, the troops of the Western Group of Occupation Forces actively took part in the Holocaust.