Detectives from the Homicide and Major Crime Command are investigating the serious assault of a Serco security guard.
At approximately 13:35hrs on Monday, 29 June officers were alerted to a Serco security guard who had been seriously assaulted by a male prisoner at Blackfriars Crown Court.
The guard – a woman believed aged in her 50s – was assaulted as she escorted the prisoner between the court and a waiting van which was parked inside the court yard.
London’s Air Ambulance attended and the victim was treated at the scene before being taken to an east London hospital – she remains there in a critical condition.
Next of kin have been informed.
The man, aged 22, has been arrested on suspicion of attempted murder and remains in custody at a south London police station.
Anyone with information that could assist the investigation is asked to call the incident room based at Sutton on 020 8721 4054 or call Crimestoppers anonymously on 0800 555 111.