A cyber attack shut down a small British power plant for four days in July. Hackers affiliated with the Iranian regime were responsible, according to the Telegraph.

Tony Diver, Rozina Sabur and Matt Oliver broke the story on Saturday. It is thought to be the first time hackers linked to Tehran have closed such a facility in the UK, they wrote. They described it as the most successful attack of its kind.

What the government has confirmed

A British government spokesperson confirmed the incident to The Register on Monday.

“This story refers to an incident impacting a small-scale energy generator, and at no point was there a risk to the wider energy system,” the spokesperson said.