California shooting marks 17th US mass killing this year – a 20-year low
Experts warn this likely points to ‘regression to mean’ after recent spike in mass killings rather than continued decline
A shooting last weekend at a children’s birthday party in California that left four dead was the 17th mass killing in the US this year – the lowest number recorded since 2006, according to a database that tracks them.
The mass killings – defined as incidents in which four or more people are killed in a 24-hour period, not including the killer – are tracked in a database maintained by the Associated Press and USA Today in partnership with Northeastern University.
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© Photograph: Fred Greaves/Reuters

© Photograph: Fred Greaves/Reuters

© Photograph: Fred Greaves/Reuters