Sellafield nuclear site hacked by groups linked to Russia and China

Some of Sellafield’s most sensitive activities such as moving radioactive waste, monitoring for leaks and checking for fires may have been compromised. Composite: Guardian Design/Alamy

The UK’s most hazardous nuclear site, Sellafield, has been hacked into by cyber groups closely linked to Russia and China, the Guardian can reveal.

The astonishing disclosure and its potential effects have been consistently covered up by senior staff at the vast nuclear waste and decommissioning site, the investigation has found.