He was arrested under Section 41 of the Terrorism Act 2000 following a search of a property in the Londonderry area.
He was also arrested in relation to a hoax security alert last month on Lone Moor Road in Derry/Londonderry where a suspicious object was found in the middle of the road, close to Celtic Court which caused significant disruption for local residents and football fans arriving for the Derry City v Shamrock Rovers game.
The man has been taken to Musgrave Serious Crime Suite where he is being questioned by detectives.
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