TL/DR –
The article discusses a database that covers mass shooting cases from 1982 to 2012, which has been updated several times. It provides additional information on how the database was built and how changes to the baseline for victim fatalities have been implemented. However, recent shootings that resulted in less than three deaths were not included in the database, and the challenge of defining and tracking such incidents are explained with linked context articles.
Our database, covering cases from 1982 to present, has been updated and enlarged many times. For insight and context on this data, see our Mass Shootings in America Guide, featuring an interactive map of all cases.
[Note, 4/24/22: For explanation on why this database excludes incidents like the NYC subway shooting or DC school shooting where less than three victims died, read this article and this article.]
You can view the base spreadsheet here and download the entire database in CSV format here.
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