Three cases in which gun laws were tightened following tragic mass shootings. The second mass shooting in five years at Fort Hood Army base left four dead, including the shooter, and 16 wounded. And on June 12, 2016, the United States saw the worst mass shooting in its history. Here, we look at three cases in which gun laws were tightened following tragic shootings—in Australia, Scotland, and Finland. The Dunblane massacre led within two years to gun control lawsAs Reuters noted, the Dunblane massacre led within two years to gun control laws that effectively banned civilians from owning handguns.