Deadliest Active Shooter Incidents in United States History
The following active shooter incidents are the deadliest to have occurred in modern U.S. history (1949 to present). If the shooter was killed or died by suicide during the incident, that death is not included in the total.
October 1, 2017 - 58 killed, 500+ injured Mandalay Bay Shooting (Las Vegas, Nevada)
In most cases, the active shooter will use a firearm. In rare cases, the active shooter may use other weapons and/or even improved explosive devices that cause more injuries and act as an impediment to law enforcement and emergency responders. Some of the improvised explosive devices are homemade and may detonate immediately or may have delayed fuses. No attempt should be made to go near or handle these devices.
An active shooter incident will typically end in one of four ways:
The shooter commits suicide.
The shooter and law enforcement engage in a firefight.
Unarmed citizens successfully restrained the shooter.
Armed citizens exchange gunfire and take out the threat.
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Frequently Asked Questions
What is the definition of an active shooter?
The United States Department of Homeland Security defines an active shooter as "an individual actively engaged in killing or attempting to kill people in a confined and populated area; in most cases, active shooters use firearms and there is no pattern or method to their selection of victims."
What is the definition of a mass shooting?
A mass shooting is commonly defined as an act of violence—excluding gang killings, domestic violence, or terrorist acts sponsored by an organization—in which a shooter kills at least four victims.
Which country has Had the most mass shootings?
The United States had had more mass shootings than any other country.
What is the deadliest mass shooting?
The deadliest mass shooting occurred on October 1, 2017 by Stephen Paddock in Las Vegas, Nevada. The shooter opened fire on a crowd of people at the Route 91 Harvest Music Festival on the Las Vegas Strip.
What state has had the most mass shootings?
The 10 deadliest mass shooting and active shooters incidents have occurred in Texas, California, Florida, Virginia, Connecticut, Oklahoma and Nevada.
How many school shootings occurred in 2018?
A total of 24 school shootings occurred on K-12 school property that resulted in firearm-related injuries or deaths in 2018.
How many people were killed in a school shooting in 2018?
A total of 35 people were killed and 79 people were injured in a school shooting in 2018.
How many school shootings have happened in 2019?
As of May 2019, 15 school shootings have occurred in the United States.
How many school shootings have happened in 2020?
As of August 2020, six school shootings have occurred in the United States.
How many mass shootings have happened in 2020?
As of September 2020, there have been 417 mass shootings in the United States, resulting in 348 deaths and 1,776 injuries, for a total of 2,124 victims.
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