Ministers pressed by Labour over cyber-attack at Sellafield by foreign groups

The thermal oxide reprocessing plant at Sellafield. The storage pond contains rows of huge bottles of spent nuclear fuel, which is highly radioactive, waiting for reprocessing. Photograph: Jonathan Player/Alamy

Ministers are under pressure to explain the actions of the government and regulators over cybersecurity at Europe’s most hazardous nuclear site after a Guardian investigation revealed disturbing vulnerabilities in its networks.

The shadow energy secretary, Ed Miliband, called on the government to urgently “provide assurances” about Sellafield, after the Guardian revealed it had been hacked by groups linked to Russia and China.