sentence: Emergencies often require delivery of different versions of the same message at the same time.
sentences_after: For example, in an armed hostage-taking emergency, the people inside a building may need to get instructions to lock the door, while police and other people may need to be aware that all of the doors could be locked and other information, so they can decide what to do.
concept_name: emergency
headings: Emergency communication system Properties of Emergency Communication Systems Separate Recipients
categories: Emergency services Communication