Police have made an urgent appeal to find the parents of a young boy who is a serious condition in hospital after being struck by a motorcycle.
The youngster, aged between nine and 10, was hit by the vehicle after getting off a bus in London.
The incident happened at around 12.20pm on Saturday when the unknown child got off a Route E3 bus on Popes Lane at the junction with Knight's Avenue, W5, in South Ealing.
Officers and the London Ambulance Service attended the scene and found the boy with a head and leg injury.
He was taken to a central London hospital where he remains with serious injuries.
Detectives are keen to locate the parents or carers of the young boy as it appears he was alone at the time of the incident.
The child is described as a white boy, 4ft to 4ft 5ins tall and has dark coloured hair.
He was wearing a black 'Parka' style anorak, with a fur edged hood and red lining. On the anorak there is a leather disc with a logo and the words 'Get outdoors'.
The boy was also wearing beige trousers and black 'tie dye' Nike trainers, with the Nike tick in fluorescent green.
A spokesman for Scotland Yard said: "It is of paramount importance that anyone who recognises his description contacts detectives immediately.
"Anyone who can assist with indentifying the boy or who witnessed the collision is asked to contact the Serious Collision Investigation Unit at Alperton Traffic Garage on 020 8991 9555, 101 or via Twitter @MetCC."
The motorcyclist stopped at the scene and is assisting detectives with their enquiries.