On 20 July 1944 a group of dissidents attempted to assassinate Hitler with a bomb and failed. Claus von Stauffenberg, cousin of Peter Yorck, was among the leading figures in this attempt to create "Day-X". However, the bombing only injured Hitler and led to a series of apprehensions. Peter Yorck was arrested and executed on 8 August 1944 for his involvement. Although Moltke himself was not involved, his close association with Yorck proved fatal as he was also executed on 23 January 1945. These arrests and executions signaled the formal end of the activities of the Kreisau Circle.