A teenager has been arrested after a car ploughed into crowds, injuring four people.
The vehicle collided with revellers in Newport, South Wales, early this morning, with footage on social media showing people screaming as it came towards them.
Three women and a man were taken to hospital, with two of the women believed to have sustained life-changing injuries.
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One clip appears to show the car - believed to be a blue Ford C-Max - reversing and driving forward twice as people attempt to stop it by hitting the windscreen and driver's window.
The car was reportedly later found burnt out.
Police, who were called to Cambrian Road at 5.30am, said an 18-year-old man had been arrested on suspicion of causing injury by dangerous driving.
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Superintendent Glyn Fernquest reassured people that the incident is not believed to be terror-related and had no links to the Newport marathon taking place today.
"This is a shocking incident for everyone involved," he said.
"Specialist officers are currently investigating and are appealing for information in relation to identifying the driver of this vehicle.
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"I'd like to just reassure the public that this incident is not believed to be terror-related and has no links to the Newport marathon that is taking place this morning.
Anyone with information is asked to call police on 101, quoting log 110 29/4/18.