A nationwide warning day will take place for the first time on September 10, 2020 and will then be carried out annually on every second Thursday in September. On the joint day of action by the federal and state governments, all warning devices will be tested throughout Germany. Precisely at 11 a.m., warning devices such as sirens are triggered simultaneously in counties and municipalities with a test alarm.

Do not be alarmed, this is a TEST which will be ended at 11.20am on 10.09.2020.

For more information, please see: https://warnung-der-bevoelkerung.de/

(Source: https://www.berlin.de/sen/inneres/sicherheit/katastrophenschutz/warnung/?fbclid=IwAR3fTE_uw0TF_f51BySippyxyvx9o-7D9n0o7syxqxqMF5rnI0exK4gJej4#warntag)