A drawing attributed to Rembrandt and looted by the Nazis in 1939 has been handed back in an unprecedented voluntary gesture, the Commission For Looted Art in Europe (CLAE) has announced. Rembrandt's " Liberation of Saint Peter From Prison" was posted in a plain envelope along with a description of how it happened to be in the hands of the anonymous current American owner who offered it without charge. It will be returned to one of the descendants of its original owners who lives in Israel."This is a unique situation because the person who had the drawing voluntarily returned it," Anne Webber of the CLAE told the Reuters news agency. The drawing was one of 700 taken by the Nazis from the home of Arthur Feldmann in Brno (Czechoslovakia) in March 1939. Feldmann and his wife, who were evicted, imprisoned and tortured, both died during the war, leaving their children and grandchildren to search for their missing properties.