Overview
- Sirens intended only for the Vordeichgebiet Overwerder flood zone were triggered across the city at 9:29 p.m. Sunday.
- The operations center issued an all-clear immediately using a long continuous tone.
- Warning apps such as NINA and KATWARN were not activated because the mistake was detected quickly.
- The emergency call center logged a mid-three-digit increase in calls as residents sought guidance, risking delays for real emergencies.
- Officials say such a citywide false alarm has not occurred in recent years, and procedures are being analyzed to prevent a recurrence.