Two men and a woman are in a critical condition after five people were mown down by a car in south-east London.
Police, paramedics and an air ambulance were called to Bromley Road in Bellingham at 8.20am on Sunday after a Mercedes hit a wall and ploughed into a group of pedestrians.
Four men and a woman, aged between 25 and 46, were treated at the scene before being taken to hospital, Scotland Yard said.
A woman, aged 35, and two 25-year-old men are in a critical condition, while two men aged 36 and 46 are in a stable condition, their injuries not thought to be life-threatening.
London Ambulance Service said the group were treated for head, chest and leg injuries.
Police said the incident was not terror-related.
A Met spokesman said: "The driver of the car was detained at the scene by an off-duty police officer before being arrested on suspicion of causing serious injury by dangerous driving.
"He was also arrested on suspicion of drink-driving before being taken to a south London hospital with a head injury."
Roads around the area have been closed while investigators examine the scene.
The crash happened outside a car wash opposite a row of shops.
The Mercedes appears to have come off the road and ploughed through a row of bollards before hitting a low wall at the end of a hedge.
The car's bonnet and boot were popped open by the impact, and its airbags all deployed. Debris was left strewn across the pavement.
Police are appealing for witnesses, and anyone who saw the incident is asked to call officers on 101 or 0208 285 1574.
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