Two cars crashed in Movers Lane at around 5.45pm yesterday, causing the road to be closed between the A13 and Ripple Road.
One of the vehicles then hit a lamppost.
The girl, in her mid-teens, was a passenger in one of the cars and was taken to hospital. Her condition is described as critical.
Police say a man who was driving one of the cars has been arrested on suspicion of causing serious injury by dangerous driving and failing to stop at the scene of the accident.
Movers Lane has since reopened.Tags: Barking
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