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Two people were taken to hospital after a crash in Crayford.
A police car signalled for a car to pull over near Shearwood Crescent at aroud 8.20pm.
The car failed to stop and a pursuit was authorised. Shortly after the car crashed with another on Perry Street.
A woman believed to be in her forties and a girl were taken to hospital with non-life threatening injuries.
An 18-year-old man was arrested and also taken to hospital as a precaution. He's now in police custody
A spokesman for the Met Police said: "A quantity of drugs and a knife was recovered from the vehicle he was driving.
"Inquiries continue and the Met’s Directorate of Professional Standards has been informed as is routine."