Officers are appealing for information after a motorcyclist was found with serious injuries in Chingford.
Police were called at around 04:45hrs on Monday, 11 December after the man, aged in his 30s, was found unconscious at the Cooks Ferry Roundabout.
He was taken to hospital where he remains in the life-threatening condition.
Officers are confident they know the identity of the man and are working to inform his next of kin.
Detectives from the Serious Collision Investigation Unit are carrying out enquiries to establish how he became injured and whether any other vehicles were involved.
They are appealing for any witnesses, or drivers with dash cam footage who were in the area at the time, to come forward.
Anyone who can help the investigation is asked to call the witness appeal line on 020 8597 4874. Alternatively, call 101 quoting CAD 818/11Dec.
