 The Treblinka trials of the 1960s took place in Düsseldorf and produced the two official West German estimates. During the 1965 trial of Kurt Franz, the Court of Assize in Düsseldorf concluded that at least 700,000 people were killed at Treblinka, following a report by Dr. Helmut Krausnick, director of the Institute for Contemporary History in Munich. During Franz Stangl's trial in 1969 the same court reassessed the number to be at least 900,000 after new evidence from Dr. Wolfgang Scheffler.
