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The man was initially detained on Wednesday, June 7, under TACT 2000 schedule 7, after arriving in the UK at Luton on a flight from Kosovo.
He was arrested and taken to a local Bedfordshire police station before being released on bail until early July.
The arrest is related to Islamism.
Officers also searched a residential address in the Watford area as part of the investigation. All searches have now been completed, but inquiries continue.
