Iran-linked hackers are suspected of forcing a small British power generator offline for four days last month, the latest sign that Tehran-linked cyber activity may be moving from probing vulnerable systems to causing disruptions U.S. officials have long warned about.

Iran-linked hackers were behind the outage, according to British security officials who spoke with multiple news outlets.

“To be clear: there was no threat to the wider grid and nobody lost power. We have one of the most resilient energy systems in the world,” UK Energy Minister Michael Shanks said in a statement.

He described the generator as “tiny” but said his department had…

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