Bianca Ali could be fined £500 for organising a protest over Mohamud Mohammed Hassan's death.
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By Dafydd Morgan
BBC News
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Video caption: Further protests outside Cardiff police station after Mohamud Mohammed Hassan's death South Wales police and crime commissioner said an investigation must be allowed "to take its course".
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Video caption: Hundreds march over arrested man's death Mohamud Mohammed Hassan was arrested at home on Friday but released without charge on Saturday.
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Video caption: Mohamud Mohammed Hassan's death in Cardiff investigated Officers were called to an address on Saturday night with the death being treated as "unexplained".
By Dafydd Morgan
Newyddion BBC Cymru
By Carys Betteley
BBC News
By Tyler Edwards
Digital Journalism Apprentice
By Jenny Rees
BBC Wales home affairs correspondent