Police are appealing for witnesses and anyone with dashcam footage to come forward following a road traffic collision in Camden.
Officers were called by the London Ambulance Service at 2.42pm on Tuesday, 19 March to reports of a bus in collision with a pedestrian on Camden Road, NW1. Officers and the London Fire Brigade attended.
The pedestrian, a 63-year-old man, was taken to an east London hospital, where he remains in a critical condition.
His next of kin are aware.
Officers from the Serious Collision Investigation Unit are appealing for anyone who was in the area and saw the incident, or who may have dashcam footage, to contact them via the incident room number 0208 991 9555.