Six people have been arrested on suspicion of being members of the banned far-right group National Action.
Five men from Cambridge, Banbury, Wolverhampton, Leicester and Stockport, and a woman from Banbury were detained by police earlier.
All six are being held at a police station in the West Midlands.
Police said the suspects, aged between 21 and 37, were detained under Section 41 of the Terrorism Act as part of a planned operation.
They were arrested on suspicion of being concerned in the commission, preparation and instigation of acts of terrorism, namely on suspicion of being a member of a proscribed organisation, National Action.
The six arrested people are:
A 26-year-old man from Cambridge
A 21-year-old man and a 37-year-old woman both from Banbury, Oxfordshire
A 28-year-old man from Wolverhampton
A 26-year-old man from Leicester
A 24-year-old man from Stockport
West Midlands Police said the arrests were intelligence-led and carried out in conjunction with a number of other counter-terrorism units across England.
"There was no threat to public safety," a force spokesperson said.
A number of properties are also being searched as part of the operation.
(huppariturpoillekin tiedoksi, nuo ovat niitä natseja)