Wall of silence' worries police MELBOURNE, Thursday. - The wall of silence which police investigating the murder of two Shepparton teenagers are encountering, is causing them grave concern. The chief of the homicide squad. Inspector Frank Holland, said tonight the job of detectives investigating the "dastardly murder" was being made extremely difficult by the apathy of local residents. Inspector Holland said many people, especially teenagers, questioned by police had not told all they knew about the case. "We feel that some people who know more than they arc telling us are scared of reprisals." Inspector Holland said. He said that police would eventually find the people responsible, and they would be punished. The bodies of the two Young people were found in a paddock at East Murchison 20 miles from Shepparton on Saturday. The pair, Gary Heywood. 18, and Abina Madill, 16, had been murdered. Gary was shot through the head with a rifle and Abina battered to death.