The 1996 Dunblane massacre and the outcry that followed are held up in the US as a textbook example of how an act of terror mobilised a country to demand effective gun regulation.
The atrocity, in which 16 children and their teacher were killed, provoked a wave of national revulsion that, within weeks, led to 750,000 people signing a petition demanding a change to the law. Within a year and a half, new legislation had outlawed the ownership of handguns.
