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Gun-control measures that Australia adopted after a 1996 massacre have eliminated mass killings and halved the number of suicides and deaths from firearms, according to a new study.

There have been no mass killings since the passage of the first measure just after the massacre in Port Arthur, Tasmania, researchers led by Simon Chapman at the University of Sydney said in the study. It's in December's issue of Injury Prevention. In contrast, there were 13 such killings in the previous 18 years. The study covered 1979 to 2003.

"Removing large numbers of rapid-firing firearms from civilians may be an effective way of reducing mass shootings, firearm homicides and firearm suicides," the authors said.

Australia's state and federal governments introduced new rules banning the use of semi-automatic and pump-action shotguns and rifles after the Port Arthur incident, in which Martin Bryant killed 35 people in a cafe and parking lot.