Last posting: 2026-10-12
Gun Facts maintains a database of U.S. mass public shootings (MPSs). This database uses the original criminology definition of MPS: four or more people are killed in a single location, not including attackers and not part of another crime.
The Gun Facts MPS database has two elements that were first found in this database (though other researchers have replicated our efforts). This includes:
- Determining if any of the weapons used conformed to the 1994 Federal Assault Weapons Ban criteria.
- If the event was a “cattle pen scenario”, which is a unique Gun facts observation about what makes MPSs more deadly.
The file is a Microsoft Excel spreadsheet. It is locked. You will not be able to edit it but you can review the data and the notes in the individual cells.
Download the database with this link
A note about notes: when you see a red triangle in the upper-right corner of a cell, that indicates that there is a note embedded in that cell. You can hover over that cell or you can right-click and select “Show Note” to get more information about why the value in that cell was chosen.
