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A teenage clubber’s finger was torn off as she climbed a 10ft metal fence to get into an illegal warehouse rave that had been sealed off by police.

The girl’s little finger was sliced off when she joined hundreds trying to climb into the event that drew thousands of teenagers to an empty storage centre in Charlton, south-east London.

Witnesses said up to 200 people had tried to scale the spiked metal fence surrounding the building after officers blocked the gates at 9pm on Saturday.

It is understood that there were too many people for police to disperse so officers took a decision to prevent more clubbers from gaining access while allowing the rave to continue.

Nine people were arrested as part of the operation and sound equipment and vehicles were seized after it ended at 6am yesterday.

Carmen, 16, was among those waiting to jump the fence to gain access to the party that had been advertised on Facebook.

She told the Standard: “Once I got over the fence I heard this really loud scream. It was such a shock. I turned around and she screamed she had lost her finger.

“Everybody was freaking out. We were looking for it for ten minutes. She was screaming and inconsolable. “Everyone was looking at the floor but a boy was trying to climb over the fence and said ‘Oh my god, it’s here’. About five people were filming it.

“I didn’t want to look but something made me. I had to walk off I felt so sick.

“The policeman was talking to us with the finger in a bag. Police were trying to calm her down. I’m sure she wasn’t listening to them – she was in so much shock. The police bandaged her hand.

“Then it felt like about 20 minutes before the ambulance turned up. She was holding the hand that was bleeding and shaking a lot. There was blood everywhere.

“She didn’t have any friends with her and nobody went in the ambulance with her. Now, looking back, I feel I should have gone with her.”

Another witness, Amber, said: “As she jumped over and let go her finger got swiped off by the fence. It was caught in between the three metal spikes. It was awful. People said it was like a horror movie. Some boy was sick because of it.”

Amber received puncture wounds on the back of her legs when she fell onto the fence as she tried to get into the party. She added: “My leg was really bleeding. It hurt and I was worried I would have to get a tetanus jab.”

The event was organised to mark the first anniversary of Big Vibes, which describes itself on Facebook as: “a London-based organisation that runs big (strictly 16+) underground parties for all you true ravers.”

The page boasted the day before the event that more than 4,000 people would be attending. Police are now trying to trace the organisers

An online advert told ravers to expect four stages, fire dancers, food, over 60 DJs and MCs, face painting and a fully stocked drinks and balloons bar.

It warned that only two beers were allowed per person, “anymore and they will be taken”, and asked clubbers to email for an invitation disclosing the location.

One witness saw “underage” teenagers travelling to the event by train and said they were openly talking about drugs and school.

He said: “One boy was saying to girls ‘I got weed’ and two other girls said ‘We’ll pickup up on the way’.”

Police were called to the rave in Stone Lake Retail Park at just after 9pm on Saturday.

Seven men and two women have been arrested and remain in custody at south London police station.

Chief Superintendent Chris Hafford said: “The organisers have shown a reckless disregard for the impact that an event like this has on the local community and for the safety of those attending.

“Officers from Greenwich Borough will be working with local partners to investigate offences linked to this event and prevent further events like this taking place.”