After analysing thousands of images, police now believe that two "distinct" groups of attackers converged on Pc Blakelock. At least six figures in the scrum around the fallen policeman have been identified. Silcott was convicted and later cleared on appeal of murdering Pc Blakelock. Silcott, 44, was released from prison a year ago on licence after serving 17 years for the murder of amateur boxer Anthony Smith, 24. Two other men, Engin Raghip and Mark Braithwaite, were also cleared by the Appeal Court. Silcott maintained during a recent BBC documentary that he was asleep at a friend's flat during the riots.