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Police appeal for witnesses after serious crash involving mother and her children in Dartford
Officers were called to the collision on Friday 19 December, just before midnight.
A grey Fiat Punto with four occupants had left the carriageway on the A282 near to the M25 junction, 1B.
A seven-year-old girl, a 39-year-old male passenger and a 36-year-old woman were thrown from the vehicle and sustained life-threatening injuries.
All, who are from the Dartford area, were taken to hospital for treatment where they remain in critical conditions.
A 10-year-old boy was also involved and suffered minor injuries.
There were no other vehicles involved, but police are keen for witnesses to come forward to help them identify what happened to cause the collision.
If you saw the incident and can help police with their inquiries, please call the Serious Collision Investigation Unit on 01622 798538.