Russia-linked threat actors allegedly seized control of a Norwegian hydroelectric dam and caused a torrent of water to gush out unnoticed for several hours.

That’s the claim from Norwegian Police Security Service (PST), which took the extraordinary step of attributing the cyberattack to Moscow.

In April, unidentified hackers opened up the floodgates and unleashed 500 litres (132 gallons) of water every second for four hours – the equivalent of about three Olympic swimming pools.

Beate Gangås, the head of PST, said: “Over the past year, we have seen a change in activity from pro-Russian cyber actors.

“The aim of this type of operation is to influence and to cause fear and chaos among the general population. Our Russian neighbour has become more dangerous.”

The Russian embassy in Oslo slammed the claims as “unfounded and politically motivated”.

It told Reuters: “It is obvious that the PST is unsuccessfully trying to substantiate the mythical threat of Russian sabotage against Norwegian infrastructure this year, which it itself invented.”

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