Police are appealing for information following a fatal collision in Croydon.
Police were called by the London Ambulance Service at just before 9am to Wellesley Road, following reports of a van in collision with a child.
The driver stopped at the scene.
The three-year-old girl was taken to St George's hospital but was later pronounced dead. Next of kin have been informed.
Officers from the Road Death Investigation Unit at Catford Traffic Garage are investigating.
The driver has been arrested on suspicion of causing death by careless driving and remains in custody at a south London police station.