Source: United Kingdom London Metropolitan Police
Detectives investigating a serious assault in central London have issued a CCTV still of a man they wish to identify.
The man is white, aged between 25 and 35 years old, around 5ft 9ins tall, of heavy build with short dark hair.
The appeal relates to an incident in which a man was found unconscious on Cambridge Circus, W1 at 22:35hrs on Tuesday, 15 December.
The 51-year-old victim was taken by the London Ambulance Service to a west London hospital where his condition is described as life-threatening.
There have been no arrests and enquiries are ongoing.
Anyone who can identify the man shown in the image should call police on 101 or Tweet @MetCC quoting Cad 7882/15DEC.
To remain 100% anonymous call Crimestoppers on 0800 555 111.