During a 13-month period, four children were abducted and murdered with their bodies left in various locations within the county. The children were each held from 4 to 19 days before being killed. Their deaths triggered a murder investigation which at the time was the largest in US history. The murders are still unsolved.Fear and near mass hysteria swept southeastern Michigan as young people were inundated with information on "stranger danger", and parents clogged streets around schools dropping off and picking up their children. The few who did walk, walked in groups and under the watchful eyes of parents in "safe houses", where children could go if they felt uncomfortable. Children even avoided using a playground directly behind the Birmingham police station. One incident in Livonia involved a tow-truck driver who assaulted a man he had seen asking two boys on the street for directions. He turned out to be a tire salesman on a business trip from Akron, Ohio, who had gotten lost with no knowledge of the slayings. The Detroit News offered a $100,000 reward for the killer's apprehension.