Some of the interactive graphics and charts below were created using Google Fusion Tables. Experiment with hovering your mouse over the graphics for more detailed information.
Timeline of incidents since 1966
The timeline chart below displays the number of victims, either fatal or non-fatal, since 1966. Click on the slider handles at the bottom to zoom into a particular time.
By displaying the same data as a scatter plot, we see clusters of victims throughout the five decades.
Analysis of incidents by type of place
The pie chart shows the percentage of the incidents that occurred in certain types of place. The size of each node is proportional to the number of mass shooting incidents.
About 40% of these shootings, according to our data, are occurring in school related facilities and about 20% are occurring in business related facilities.
Network graph of possible motive and place type
This graphic displays the relationship between the possible motives that triggered the shooting and the place type in which the incident occurred. Motives are distinguished in blue and place type in yellow. The node size is weighted by the total number of victims, either fatal or non-fatal, involved in the incident.
Relationship between possible motive and number of victim fatalities
This graphic displays the shooters' possible motives and the number of victims that were fatally wounded in the incident.
The largest number of shooters have no obvious motivating factor to commit a shooting other than a mental illness with 30 incidents, followed by individuals that were terminated or reprimanded at their workplace, with 21 incidents.
History of mental illness
This chart demonstrates the portion of victims that result from a mass shooting incident committed by a person or persons with a history of mental illness. Just over half of the incidents involve shooters suffering from a mental illness, while nearly 65% of victims arise from shootings committed by mentally ill shooters, twice that of shooting committed by those without a history of mental illness.
Network graph of shooter's fate
This graphic shows the relationship between the shooter’s fate and the type of place where the incident occurred. The size of each node is proportional to the number of fatalities. For a more generalized view of this graphic, decrease the number of nodes. Click on the + button to zoom into the graphic.
Fate of shooter and number of victims
The graphic below displays the relationship between the shooter’s fate, age, and the number of victims injured and killed. The count() variable represents the number of cases per shooter fate, SUM(Number of Fatalities) is the sum of fatalities per the fate of the shooter (arrested or deceased), and SUM(Number of Injured) are sum of injuries per the fate of the shooter (arrested or deceased).
Note that the larger number of fatalities and injuries are associated with shooters who reach their demise by their own hand, law enforcement, or a civilian; the average number of fatalities almost doubles among shooters who commit suicide or are killed, as demonstrated by the graphic below.
Shooter's age and number of victims
The graphic below displays the relationship between the total number of fatalities, injuries, and the shooter's age. The count() variable represents the number of incidents per age group, the SUM(Number of Fatalities) and SUM(Number of Injured) are sum of fatalities and injuries among each age group.
Incidents where the shooters are in their twenties result in the most fatalities and injuries, about 30%, compared to other age groups. The oldest shooter in our records is 70 years old, and the youngest is 12 years old.
Shooter's relationship to the location of the incident
This graph displays the shooters' relationship to the place where the incident occurred, as well as the number of victims, fatal and non-fatal, that resulted in each place relationship.
An equal number of incidents occurred at a place where the shooters had worked or conducted business as incidents involving schools that had shooters who had been enrolled as a student at some point, with 48 records each.
States by number of shootings
The graphic below presents the ten states with the most shooting incidents, as well as the total number of victim fatalities and injuries that resulted from the mass shooting events in each state.