Lockdown:

Lockdown is in response to threats posed by armed aggressors. These threats could include attacks involving firearms, knives or blunt objects.

Shelter-In-Place:

Shelter-In-Place is appropriate for threats posed by atmospheric contamination. These threats could include accidents or attacks involving chemical, biological or radiological hazards.

Seek Shelter:

Seek Shelter is in the event of a tornado, severe thunderstorm, lightning or other natural phenomenon weather event in the area.