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.
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