What is an Active Shooter?
An active shooter is an individual actively engaged in killing or attempting to kill people, most often in populated areas. In most cases, active shooters use firearms and there is no pattern or method to their selection of victims. In some cases, active shooters use improvised explosive devices to create additional victims and to impede first responders.
For more information click here or here for an active shooter video (Video may not be viewable on a GOV network computer).