Bomb making material found in forest hide.
He was arrested on suspicion of being involved in the preparation of acts of terrorism under section 5 of the Terrorism Act.
He is currently being interviewed by detectives in Musgrave Serious Crime Suite.
It is understood the arrest is in relation to hides discovered in Carnfunnock Forest Park, Capanagh Forest and a number of other sites in the Larne area.
Ciaran Maxwell, a Royal Marine commando from Larne, was jailed later at the Old Bailey after he pleaded guilty to possession explosives for dissident republican terrorists.
Royal Marine commando Ciaran Maxwell jailed over dissident republican terror hide
