http://www.bbc.co.uk/news/world-13268834
Five men are being held under the Terrorism Act after being arrested close to the Sellafield nuclear site in Cumbria, according to police.
The men, who are all from London and aged in their 20s, were arrested on Monday shortly after 1630 BST.
The arrests were made after Civil Nuclear Constabulary officers conducted a stop check on a vehicle close to the Sellafield site, in Cumbria.
The men were held in Carlisle overnight and are being moved to Manchester.
The BBC's Fiona Trott said the men were thought to have been filming and were all Bangladeshi.
The BBC understands the arrests were not the result of a long running investigation.
The North West Counter Terrorism Unit is leading the investigation.
A police officer can arrest anyone they "reasonably suspect" of being a terrorist, under Section 41 of the Terrorism Act 2000.
The Sellafield site, on the Cumbrian coast, is responsible for decommissioning and reprocessing nuclear waste and fuel manufacturing on behalf of the Nuclear Decommissioning Authority.
The site, which has operated since the 1940s, is heavily protected by both private security and officers from the Civil Nuclear Constabulary
Sellafield is also home to the world's first commercial nuclear power station - Calder Hall, which operated from 1956 to 2003.
CJ
Five men are being held under the Terrorism Act after being arrested close to the Sellafield nuclear site in Cumbria, according to police.
The men, who are all from London and aged in their 20s, were arrested on Monday shortly after 1630 BST.
The arrests were made after Civil Nuclear Constabulary officers conducted a stop check on a vehicle close to the Sellafield site, in Cumbria.
The men were held in Carlisle overnight and are being moved to Manchester.
The BBC's Fiona Trott said the men were thought to have been filming and were all Bangladeshi.
The BBC understands the arrests were not the result of a long running investigation.
The North West Counter Terrorism Unit is leading the investigation.
A police officer can arrest anyone they "reasonably suspect" of being a terrorist, under Section 41 of the Terrorism Act 2000.
The Sellafield site, on the Cumbrian coast, is responsible for decommissioning and reprocessing nuclear waste and fuel manufacturing on behalf of the Nuclear Decommissioning Authority.
The site, which has operated since the 1940s, is heavily protected by both private security and officers from the Civil Nuclear Constabulary
Sellafield is also home to the world's first commercial nuclear power station - Calder Hall, which operated from 1956 to 2003.
CJ