Take immediate law enforcement measures

Take immediate law enforcement measures, i.e.:

a. Isolate the area affected by the

Unstable condition involving an impending abrupt or significant change that requires urgent attention and action to protect life, assets, property or the environment.
 

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b. Establish

Sudden, urgent, usually unexpected occurrence or event requiring immediate action.
Note 1 to entry: An emergency is usually a disruption or condition that can often be anticipated or prepared for, but seldom exactly foreseen.

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traffic control

c. Maintain public order within the affected area

d. Launch investigations

e. Open-up lines of transportation and communication to safe(r) areas