Fourteen people have been injured, police say, following a collision during an illegal street race in Stevenage.
Hertfordshire police said some of those being treated are seriously injured.
The crash, which happened at about 9.45pm on Thursday, involved two cars.
Footage from the incident appears to show the two vehicles colliding at high speed before careering into bystanders.
One car is seen turning in from a side road when another speeds past and clips the slower vehicle, sending both veering off in opposite directions.
Crowds appeared to be standing at the side of the road and on the central reservation before the crash.
One witness said on Twitter: “I’ve just witnessed that horrendous crash in #Stevenage, no more than 50ft away from me. I’m still trying to process it all.”
Another Twitter user said they had spent over an hour holding a girl who was injured in the collision, describing it as “hard to process”.
Social media reports suggest the incident happened during a car meet event.
The meets appear to be a weekly event for car enthusiasts, but footage from Thursday evening clearly shows the cars speeding just metres from gathered crowds.
A police spokeswoman said: “There were a number of people in the area at the time and 14 people are presently being treated for injuries, some of which are serious.”
A spokesperson for the East of England Ambulance Service initially said 12 people had been taken to three hospitals – the Lister Hospital in Stevenage, Watford General Hospital and the Princess Alexandra Hospital in Harlow.
An air ambulance attended the crash and emergency services are expected to remain at the scene for some time.
Police have appealed for witnesses and urged anyone with footage of the incident to keep hold of it.
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