Hacker Suspected After Chemical and Nuclear Risk Alerts Sent to Kyiv and Zaporizhzhia

Residents in Kyiv received mobile alerts warning of chemical and nuclear risks on Sunday evening, in what local officials said was likely the result of a hacker intrusion into the warning system. The same type of alert was also sent to people in Zaporizhzhia, a city in southeastern Ukraine close to the front line of the war with Russia. The messages also referred to street fighting, adding to concern among users who saw the notifications on their phones.

The Kyiv Military Administration said the alerts were issued after a probable cyber intrusion into the system. According to the public Ukrainian warning tool, the notifications were sent at about 10:50 pm local time, which was 5:50 pm in Brazil. Officials said the Air Alert app, used to warn the population, had probably been subject to hostile influence.

Some residents posted screenshots on social media showing the messages, and one said the alert appeared in Russian. The incident affected two major urban centres at a time when Ukraine remains under regular threat from missiles, drones and other wartime disruptions. Public warning systems are a key part of civil defence in the country, helping residents respond quickly to air raids and other emergencies.

A false or manipulated alert can create confusion, undermine trust in official warnings and complicate the work of local authorities. Kyiv and Zaporizhzhia have both been exposed to repeated security risks since the full-scale war began, although the latest episode appears to have targeted the digital alert infrastructure rather than physical sites. Zaporizhzhia is especially sensitive because of its proximity to the front line.

The use of a public warning app means any interference can have immediate consequences for civilians who rely on it for timely instructions. The case also highlights the wider vulnerability of wartime communications systems to cyber interference. Ukraine has repeatedly faced attempts to disrupt state services and public information channels during the conflict, making digital resilience an important part of national security.

In this instance, officials framed the problem as likely enemy influence, but they did not immediately provide technical details about how the intrusion may have happened. It remains unclear who was behind the alerts, whether the system was compromised directly or through another form of interference, and how many people received the false warnings. Authorities have not yet said whether the app has been fully secured or whether any investigation is under way.

What to watch next is whether officials confirm the cause, restore confidence in the alert system and explain how similar disruptions will be prevented.

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