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Two people were arrested after a car struck a garden wall in Beltinge Road, Herne Bay.
Emergency services were called to the scene in the early hours of Monday morning.
A 16-year-old girl from Herne Bay, who was a passenger in the car, suffered serious facial injuries and was taken to the QEQM Hospital at Margate.
She has since been arrested on suspicion of taking a vehicle without consent.
The driver - a 23-year-old man also from Herne Bay - was arrested on suspicion of taking a vehicle without consent, having no insurance and driving without a licence.
The pair have both been released on bail.