Three men and a woman have been arrested in East Sussex as part of an investigation into extreme right-wing terrorism.
The arrests were carried out by specialist officers in Eastbourne and Brighton.
Counter Terrorism Policing South East (CTPSE) said a 27-year-old woman from Hailsham was arrested, along with three men from Eastbourne, aged 33, 36 and 41.
All are being held under section 41 of the Terrorism Act 2000 while searches take place at residential properties.
Assistant Chief Constable Steve Rayland said the arrests were "part of a planned operation" supported by Sussex Police.
"People living in the local area may notice an increased police presence while search activity takes place, which is routine in cases of this nature," said Mr Rayland.
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