Ukraine's Air Raid Alert app sends false radiation and street-fighting warnings in suspected hack; Air Force says there is no radiation threat

Ukrainians using the country's most popular air raid app received false warnings of radiation, chemical hazards and street fighting on Sunday, November 1, 2026, in what the Air Force said was a likely hack. "There is no radiation threat," it told the public, asking people to stay calm and to follow its official channel.

The Digital Transformation Ministry said the Air Raid Alert app was not operating, while street sirens and other warning systems kept working. Regional officials warned that the incident may also involve a phishing operation aimed at users.

What people saw on their phones

Place	False warning shown
Kyiv	Radiation, street fighting
Kharkiv	Nuclear hazard, chemical hazard, street fighting
Zaporizhzhia	Street fighting, artillery fire

One erroneous message, written in Russian, claimed that Russia had deployed its hypersonic Oreshnik missile. There were also reports that the false alerts set off some sirens, although how widely that happened was not immediately clear.

Kyiv's city authorities rejected the radiation claim and told residents to rely on the Kyiv Digital app and the city's street warning system.

The Air Force's wording pointed to Moscow without naming it directly, saying the app had probably come under "enemy influence". No group has claimed responsibility, and no technical account of how the app was reached has been published.

Why a fake alert is dangerous in wartime

Air Raid Alert, developed by Ajax Systems and Stfalcon with support from the Digital Transformation Ministry, is a fixture on Ukrainian phones. It tells people when to go to shelters during Russian missile and drone attacks, which have been a part of daily life since the full-scale invasion of February 2022.

A false radiation warning does more than cause a night of panic. Radiation advice is different from missile advice, and people who believe it may seal themselves indoors or try to leave a city. The bigger risk may come later. If people begin to doubt an alert on their phone, some may ignore a genuine one when missiles are on the way.

It also lands at a tense moment. The false alerts came hours after the local truce around Kherson and the Oleshky area expired, with Kyiv saying Russia had refused to extend it. Russian strikes have also cut power to thousands of people, and Ukraine's energy system faces its toughest months as winter begins. Radiation fears are a particularly sensitive subject in a country that still lives with the memory of Chornobyl and has Europe's largest nuclear plant, Zaporizhzhia, on the front line.

Alert systems have been targeted before on both sides of this war. In February 2023, hacked broadcasters in Russia aired fake warnings of a missile strike and told people to seek shelter, and the emergencies ministry there blamed hacked servers. In Ukraine, a system failure in Poltava region in August 2025 sent a false radiation warning during a drone attack, though officials then called it a malfunction rather than a hack.

What to do if you are in Ukraine

• Do not open links in unexpected alert messages, given officials' phishing warning, and do not enter any personal details.
• Check official sources: the Air Force's channel, your regional administration and, in Kyiv, Kyiv Digital.
• Treat sirens as real. Sirens and other warning channels continue to work, so go to shelter if you hear one.
• Wait for the all-clear on the app. Reinstall or update it only when officials or the developers say it is safe.

The next thing to watch is a technical statement from the ministry or the developers on how the alerts were sent, and when the app will return to service.