Two more victims of Arab terrorism were added to the official lists today, although they were killed over three months ago. Police had originally thought that these killings were of a criminal nature. Israeli security officials have arrested six members of a ten-man terrorist cell - the other four are thought to be hiding out in the Palestinian Authority - who were responsible for the murders. The victims, Simcha Ron of Nahariya and Dina Gueta, were killed on separate occasions in northern Israel.