Among Bosnian refugees in Germany, there were rumors of executions in Kozluk, during which the five hundred or so prisoners were forced to sing Serbian songs as they were being transported to the execution site. Although no survivors have since come forward, investigations in 1999 led to the discovery of a mass grave near Kozluk. This proved to be the actual location of an execution as well, and lay alongside the Drina accessible only by driving through the barracks occupied by the Drina Wolves, a regular police unit of Republika Srpska. The grave was not dug specifically for the purpose: it had previously been a quarry and a landfill site. Investigators found many shards of green glass which the nearby 'Vitinka' bottling plant had dumped there. This facilitated the process of establishing links with the secondary graves along Čančari Road. The grave at Kozluk had been partly cleared some time prior to 27 September 1995 but no fewer than 340 bodies were found there nonetheless. In 237 cases, it was clear that they had died as the result of rifle fire: 83 by a single shot to the head, 76 by one shot through the torso region, 72 by multiple bullet wounds, five by wounds to the legs and one person by bullet wounds to the arm. The ages of the victims were between 8 and 85 years old. Some had been physically disabled, occasionally as the result of amputation. Many had clearly been tied and bound using strips of clothing or nylon thread.