Senior police figures to answer G4S questions

Her Majesty's Inspector of Constabulary Dennis O'Connor. Credit: PA

Sir Denis O'Connor, outgoing HM Chief Inspector of Constabulary, will give evidence on Olympics security.

Stephen Greenhalgh, left, pictured with London mayor Boris Johnson. Credit: PA

Stephen Greenhalgh, Deputy Mayor of London for Policing and Crime, will give evidence on policing in London.

Police Commissioner Bernard Hogan-Howe has been asked to give oral evidence. Credit: PA

Metropolitan Police Commissioner Bernard Hogan-Howe has also been asked to give oral evidence.

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G4S grilling for top police

Senior police officers will today be questioned about the shortfall in Olympics security staff provided by the private firm G4S.