 In April 1938, whilst serving as a sergeant in Haifa, he Investigated the deaths of two Arab women and two British Police officers who were killed in a bomb blast on a train.Using his many Jewish friends and contacts he traced the planning of the attack to Avraham Stern.Stern later would break away from the Irgun and form his own splinter group focusing on the British presence rather than the persecution of Jews by Nazis, Arabs or other groups.