Overview

• The system was trialed across 28 cities in seven northern states, with alerts sent in Amazonas municipalities including Manaus, Manacapuru, Novo Airão and Iranduba, and in capitals such as Belém and Macapá.
• Many residents in Manaus reported being startled by the high-volume test tone, and the episode quickly drove reactions and memes on social media.
• Defesa Civil Alerta delivers on-screen warnings without registration to Android phones manufactured from 2020 that are connected to 4G or 5G, and the signal can sound even when a device is set to silent.
• In Acre the initial trial covered Rio Branco, Cruzeiro do Sul, Jordão and Brasiléia, and officials said statewide availability will begin as needed starting next week.
• Civil Defense leaders emphasized precise state–municipal coordination to maintain credibility, and additional regional tests are scheduled in the Center-West on September 27.