Lockdown

Hazards

• A security action restricting movement and access during an immediate external or internal threat.

Controls

• Use trained authority, plain communication, safe rooms, accountability, emergency liaison, and reunification plans.

Personal protective equipment

• Select task-specific PPE only after hazards and higher-order controls have been evaluated.

Regional considerations

• Applicable law, permits, collective agreements, venue rules, and qualified-person decisions take precedence.

In practice

Use trained authority, plain communication, safe rooms, accountability, emergency liaison, and reunification plans.

Explore related entries

• Shelter in place
• Active-threat plan