17 people have been injured after a high speed crash at a car meet-up in the UK, according to police in Hertfordshire.
It's believed two cars crashed last night in Stevenage as car enthusiasts gathered to raise money for charity.
A group of people watching were hit in the crash, with local police saying of those injured were seriously hurt.
The local fire service said they used cutting gear to free one person trapped in a vehicle, as well as providing trauma care to a "large number of other casualties".
Event organiser Rix Sidhu said: "We are devastated. I've been running this for 10 years and we have never had one incident.
"We were raising money for charity, as we often do, and there was no speed element to it.
"We held the meet in a car park with a speed bump at the entrance. But unfortunately some people went a bit rogue."
He added: "We try and stop that, we urge people - urge them on social media beforehand - not to go out on the roads, not to risk injury or anything."
Mr Sidhu said they won't be organising any more events in the wake of last night's incident.
The UK's road safety minister Michael Ellis says at the moment the exact circumstances are unclear so it's "too early" to say exactly what happened.