Four alleged right-wingers, seemingly acting suspiciously in a County Antrim forest, remain in custody.
The men were detained at houses in Ballymena and Coleraine yesterday.
Police say the individuals appear to have extreme views about tensions in north-eastern Europe.
Man arrested over threats to elected representatives
Teachers’ unions welcome pay increase while pledging to tackle workload
Minister to explore if he can enforce use of Ulster Banner at Commonwealth Games
Domestic abuse calls to police climb over Christmas and New Year