Odinga's ODM once again wanted supporters to join a demonstration Friday in Uhuru Park, but CNN's Kim Norgaard said a heavy police presence was preventing protesters from making their way to the site.

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Samantha Rigg-David, the sister of Sean Rigg, a 40-year-old man who died in police custody in 2008 in Brixton, and Alastair Morgan, whose brother Daniel - a private detective - was found with an axe in his head in a south London pub's car park in 1987, took part in the demonstration.

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At the March 2011 demonstration, there were clashes between police and protesters in Trafalgar Square - hours after a peaceful march to Hyde Park.

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