From 1984 to 1996, multiple killings aroused public concern. The 1984 Milperra massacre was a major incident in a series of conflicts between various "outlaw motorcycle gangs". In 1987, the Hoddle Street massacre and the Queen Street massacre took place in Melbourne. In response, several states required the registration of all guns, and restricted the availability of self-loading rifles and shotguns. In the Strathfield massacre in New South Wales, 1991, two were killed with a knife, and five more with a firearm. Tasmania passed a law in 1991 for firearm purchasers to obtain a licence, though enforcement was light. Firearm laws in Tasmania and Queensland remained relatively relaxed for longarms.