Did you hear the sirens in Oslo and Akershus this morning? Don’t worry, it wasn’t an emergency. It was just a false alarm.

I was just finishing my first cup of coffee on Tuesday morning when a low, steady wail broke the quiet in my central Oslo apartment. It wasn’t the usual rumble of a tram or the distant horn of a boat on the Oslo Fjord; it was the drone of the “typhoon,” Norway’s national warning siren.

For a few seconds, the city seemed to pause as we waited to see if the sound would stop or mean something more serious. From my apartment, I saw people looking out their windows, trying to see how others were reacting.

The sound was heard across the capital and the surrounding Akershus region, including Bærum and Asker. It began at about 7:45am and was not a planned drill or an emergency.

Instead, the siren went off because of a “human error” during a routine test by the Norwegian Civil Defence as reported by NRK.

“The siren system many of you heard was accidentally triggered by a mistake during testing carried out by the Civil Defence. No incidents have occurred that pose a danger to the population,” the Oslo police wrote to the media.

After the sirens started at 7:45am, it took about 16 minutes for the Oslo police to confirm it was a mistake. “We simply needed that time to confirm that it was a human error and not a serious incident that was reported,” authorities said about the delay.

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Although the sirens lasted only about 30 seconds, it took almost twenty minutes before the Oslo police explained the situation on social media at 8:01am.

The Directorate for Civil Protection and Emergency Preparedness (DSB) issued an apology for the blunder. “This should not happen, and we will do everything to ensure that this does not happen again,” said DSB communications director Øistein Mjærum.

The accidental alarm made many people uneasy, especially since it happened on the four-year anniversary of Russia’s full-scale invasion of Ukraine. DSB press officer Morten Harangen admitted that the delay in confirming the error was unsettling given the current geopolitical landscape.

“We understand very well that people are scared, given the security situation we find ourselves in,” Harangen said in a statement.

“We can only apologise that it took 20 minutes before we were able to confirm what had happened. We understand that it feels like a long time”. He added that this should not happen and that they are very sorry that many people had an unpleasant start to the day.

Authorities have promised to review their notification routines to ensure they can communicate more quickly in the future.

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Warning systems

The incident stands out because authorities have designated 2026 as the “Year of Total Defence” (Totalforsvarsåret), intended to improve national emergency preparedness and civil-military cooperation.

Norway has about 1,250 siren systems across the country, mostly in cities and towns, and these can reach more than half of the population.

Normally, these sirens are only tested twice a year, in January and June, and the public gets plenty of advance warning.

Sirens are meant to warn people about immediate danger and tell residents to look for information on the radio, TV, or social media.

If the sirens sound short blasts for about a minute, it means “Danger of attack – seek cover.” According to the Civil Defense, this signal is used if there is a risk of air attack or during war preparedness exercises.

The 30-second signal heard on Tuesday morning is officially used to mean “the danger is over.”

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