Shooting massacres in Australia and other English-speaking countries often occurred close together in time. Forensic psychiatrists attribute this to copycat behaviour, which is in many cases triggered by sensational media treatment. Mass murderers study media reports and imitate the actions and equipment that are sensationalised in them. The Monash shooting occurred at the height of publicity for the Beltway sniper attacks, which was extremely prominent from 3 October to the arrest of the perpetrators on 24 October 2002, three days after the Monash shootings.