Five men and a woman have been arrested on suspicion of belonging to banned far-right terror group National Action.
West Midlands Police said the suspects, aged between 21 and 37, were detained under Section 41 of the Terrorism Act on Wednesday.
The arrests were pre-planned and intelligence-led with no threat to the public's safety, the force said.
National Action was made a proscribed terrorist organisation in December 2016, the first extreme right-wing group to be outlawed in the UK.
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