Contact - after evacuating or taking shelter
Fire - Evacuate
Active shooter/Active threat - Evacuate
Active Threat - Run. Hide. Fight
UGA Office of Emergency Preparedness - Active Threat
An active threat is an emergency situation involving a person or persons who are actively engaged in killing or attempting to kill people in a populated area by acts of either random or systematic violence.
They include any assault with a deadly weapon (guns, knives, explosives, etc.) with one objective in mind; causing as many deaths as possible.
The assailant's overriding objective appears to be that of mass murder, rather than criminal conduct such as robbery, kidnapping, etc.
Federal Bureau of Investigation - Active Shooter Incidents
Homeland Security - Active Shooter Preparedness
LiveSafe - a personal safety mobile app
Preparedness @ UGA
Risk Assessment - determining the likelihood of a risk occurring and the impact if it does