The Luftschutzwarndienst, or Air Raid Warning Service, was a civilian
organization under the guidance of the Luftwaffe that was responsible for the
timely warning of incoming enemy air raids and attacks on German cities,
towns and installations. It functioned by taking reports from its members, from the Flugmeldedienst, and from the
various related Polizei organizations, after which they processed the information
so as to set in motion the sounding of air raid sirens prior to an
attack. The organization was also responsible for the sounding of the
all clear siren once a raid or attack was over.