The Independent Police Complaints Commission has taken over the inquiry into the death of newspaper seller Ian Tomlinson, 47, at last week's G20 protests.
Anger is mounting at the police handling of the case since the Guardian
unearthed video footage of police attacking Mr Tomlinson.
David Howarth, the Liberal Democrats' justice spokesman, says a full criminal inquiry is needed.
Helen Shaw, co-director of Inquest, which campaigns on deaths in custody, says the Metropolitan police hasn't learned the lessons of the Jean Charles de Menezes case.
In other news, environment correspondent Alok Jha explains the significance of the retro-fitting of a French power station with carbon capture and storage technology.
And comedian Jo Brand tells Hannah Pool how she regards the reaction to her revelation that Carol Thatcher had used the word "golliwog" backstage at the BBC.
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Guardian Daily: IPCC takes over G20 death inquiry
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