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 declineA 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...
<p>Experts warn this likely points to ‘regression to mean’ after recent spike in mass killings rather than continued decline</p><p>A <a href="https://www.theguardian.com/us-news/2025/dec/01/stockton-california-shooting-suspect">shooting</a> last weekend at a children’s birthday party in <a href="https://www.theguardian.com/us-news/california">California</a> 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.</p><p>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.</p> <a href="https://www.theguardian.com/us-news/2025/dec/02/mass-killings-database">Continue reading...</a>
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