What is the recommended action for the rest of the building following an explosion outside the building?

In the situation of an explosion occurring outside a building, in-building relocation is the recommended action because it allows occupants to move to a safer area within the building while maintaining shelter from potential external dangers. This measure helps to minimize exposure to any immediate threats that might affect the interior environment, such as flying debris or resulting secondary hazards.

In-building relocation involves directing occupants to areas away from windows and entrances, which is critical for their safety and can help preserve order and control within the building during the unfolding incident. It is often preferred over immediate evacuation, which may expose individuals to greater risk depending on the circumstances surrounding the explosion and could also create chaos or confusion in the building.

While lockdown may be appropriate in certain scenarios, such as active threats within the building, it isn't suitable for situations like an external explosion. Similarly, remaining in place without any instructions might not provide the necessary protective measures required during a potentially hazardous situation. Thus, in-building relocation becomes a vital strategy for ensuring safety after an external explosion.