The incident happened in Blackfen Road near Wellington Avenue just after 3.20pm yesterday (September 16).
Officers and London Ambulance Service crews attended and found a girl injured.
She was treated at the scene before being taken to hospital where her condition is unknown at this stage.
We have contacted Metropolitan Police for further information.
A spokesperson for London Ambulance Service said: “We were called at 3.19pm yesterday (16 September) to reports of a road traffic collision in Blackfen Road, Sidcup.
“We sent an ambulance crew to the scene.
“We treated a child at the scene and took her to hospital as a priority.”
