Malcolm Turnbull has defended the integrity of Australia's gun laws in Hobart ahead of a commemorative service marking the 20th anniversary of the Port Arthur massacre, saying that maintaining a strong stance on firearms was "non-negotiable". Thirty-five people were killed in the massacre which centred around the Port Arthur former convict site on 28 April, 1996. It is the largest massacre by a lone gunman in Australia and prompted a massive overhaul of the country's... (GunPolicy.org)