According to a 1998 qualitative study involving survivors of the column, many of the members of the column exhibited symptoms of hallucinations to varying degrees. On a number of occasions, Bosniak men began attacking one another in an apparent fear that the other member in the column was a Serb soldier. Members of the column also reported seeing people speaking incoherently, running towards VRS lines in a fit of rage and committing suicide using firearms and hand grenades. Although there was no evidence to suggest what exactly caused the behaviour, the study suggested that fatigue and stress may have induced these symptoms.