On 10 September 2020, Germany held its first nationwide warning day. The alarm was planned for 11 a.m. The warnings in the apps NINA and KATWARN arrived on phones more than half an hour late. Many connected control centers had triggered warnings on their own, alongside the central one, and the system was overloaded. The agreed concept had provided for activation by the federal government only. Christoph Unger, president of the Federal Office of Civil Protection and Disaster Assistance for 16 years, was replaced. The warning day of 2021 was canceled, while the office built a full test environment.