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Officers were called to the meeting at Canton Community Hall in Cardiff
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Anti-terrorist police have halted a meeting at a Cardiff community centre over fears of a link to banned Islamist group Muslims Against Crusades.
Welsh Extremism and Counter Terrorism Unit officers were called to Canton Community Hall on Thursday night.
South Wales Police said it followed concerns raised by members of the local Muslim community.
One man was arrested for assault and a public order offence and remains in police custody.
South Wales Police assistant chief constable Matt Jukes said: “Last night’s activity forms part of a wider strategy to prevent radicalisation within our communities and to stop vulnerable people from being drawn into extremism or becoming prey to terrorist ideologies.