Naturally-occurring radiation was to blame for higher-than-normal levels detected at the Sellafield nuclear plant in Cumbria.
A perimeter alarm was triggered at the north of the site, leading to buildings being checked by safety staff, but it was later discovered the readings were due to "naturally-occurring background radon".
Workers were told to stay away this morning while the company carried out an investigation, but have been allowed to return this afternoon, as the plant has been given the all-clear.
Main road between Peel and Douglas to shut for tree felling
'Targeted and intelligence led approach' to protect Island's borders during Irish sailings
Airport Director role advertised with top salary of £120,000
Traders on Michael Street feel 'abandoned' by politicians in tough times
