Firefighters were called to assist emergency services at a road traffic collision on Openview in Earlsfield.
One car was in collision with a tree and eight pedestrians were involved. Three women and six children were taken to hospital by London Ambulance Service crews.
The Brigade was called at 1518 and the incident was over for firefighters by 1605. Two fire engines and a fire rescue unit from Sutton, Hammersmith and Wimbledon fire stations attended the scene.