Compared to overall firearm deaths, those resulting from mass shootings—which occurred in a Charleston church last night—are rare. But mass shootings are increasing, according to a report from researchers at the Harvard School of Public Health that was released last October.

“Between 1982 and late 2011, mass shootings occurred about every 200 days. But after September 2011, the rate of mass shootings increased to about once every 64 days, according to the Harvard researchers. And they can’t explain why,” writes Forbes’s Dan Diamond.

However, experts believe there are ways to address mass shootings, including improving screening for risk factors, resisting the glorification of mass shooters, and passing stricter gun control laws.

Australia enacted such laws after a mass shooting that killed 35 people in 1996, and they’ve been extremely successful, “but the nation’s prime minister doubted that Americans would have the will to make a similar move. ‘Millions of law-abiding Americans truly believe that it is safer to own a gun, based on the chilling logic that because there are so many guns in circulation, one’s own weapon is needed for self-protection,’ Australia’s PM John Howard wrote in an op-ed.”

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