Sellafield nuclear site hacked by groups linked to Russia and China

Exclusive: Malware may still be present and potential effects have been covered up by staff, investigation reveals

• Bottomless pit of hell, money and despair' at Europe's most toxic nuclear site

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.