Overview
- At 11:00 on September 11, the BBK sent a nationwide test alert via MoWaS across Cell Broadcast, warning apps, sirens, radio, TV, digital displays and local loudspeakers, with an all‑clear around 11:45 that did not use Cell Broadcast.
- Officials called the exercise successful and opened a public survey at warntag-umfrage.de through September 18 to gather reception feedback for a detailed evaluation.
- Temporary mobile‑network disruptions were reported by 1&1, Deutsche Telekom and O2 shortly after the alert, with 1&1 confirming brief issues and Vodafone largely unaffected; any causal link to the drill remains unconfirmed.
- Authorities piloted Automatic Safety Alert over DAB+ on selected radios to provide a warning path that works if mobile or internet service fails.
- Regional updates highlighted progress and isolated problems, including functioning new sirens in Berlin and a Hamburg mishap in which two police officers were injured during a pyrotechnic test.