The tightening of Australia’s gun laws was prompted by the worst mass murder in Australian history. On April 28, 1996, a gunman opened fire on tourists in Port Arthur, Tasmania, killing 35 people and wounding 23 more. Just twelve days later, Australia’s government responded by announcing a bipartisan deal along with state and local governments to enact gun control measures, according to Slate.

A massive buyback program yielded more than 600,000 semi-automatic shotguns and rifles, roughly one-fifth of the firearms in Australia. The laws also outlawed private sales, required that guns be individually registered to their owners and mandated that buyers present a “genuine reason” for purchasing the guns.

According to research published by Australian Labor Member of Parliament Andrew Leigh in 2010, the buyback program reduced firearm suicides by 74 percent and gun-related homicides by 59 percent, said The Sydney Morning Herald.

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