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September 27, 2019

Sundays in August are the most common days when mass shootings take place in the United States. That is one of the key findings we discovered when analyzing incident data between 2013 to 2019. While these events are highly unpredictable in timing and scale, the striking patterns in the data warrant a closer look. July and August are the most common months in which an incident occurs, and weekends are twice as likely to have an incident as weekdays. These patterns likely reflect the increased use of open, public spaces during summer weekend days. As this infographic illustrates, our analysis of mass shootings since 2013 also shows that large events, defined as any event with 10 or more casualties, have become more frequent in time with nine events occurring within the last two years. In addition, the elapsed time between deadly shootings is shortening.

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