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By corroboration, he is referring to testimony and evidence of the other young women in this case.

Many young women bravely spoke to us about their ordeals at the hands of abusers they describe as being men of Asian and Middle Eastern backgrounds, including Turkish, Kurdish and Bangladeshi.

Witnesses said another girl was raped by eight men while unconscious.

she claims that in her early teenage years, she was threatened with being buried alive or set on fire if she did not return regularly to the flat to be raped by a gang of men.

Speaking about the threatening text, former chief police officer Jim Gamble said : "Number one is he's committed a criminal offence because that's a threat to murder, and the Offences Against the Person Act makes that a crime.

"But what you do see there is the coercive control.

you see the fact that the predator is so confident in their ability, their level of competence at controlling these young people, that they don't even try and hide it or mask it.

After looking at a thousand pages of evidence seen by Sky News, Mr Gamble added : "I'd be surprised if they 're not able to pass the evidential threshold ... because what you do have is significant levels of corroboration."

Humberside Police today said they had left "no stone unturned" in their investigation into the grooming gangs operating in the area and rejected the suggestion that the evidence had not been properly handled.

"Each victim had a dedicated support officer from the police and from the local authority to ensure every aspect of safeguarding was considered.

detective chief superintendent, phillip ward said : "despite two years of intensive investigation, analysis and examination, we share the disappointment and frustration that we have been unable to identify sufficient evidence to corroborate or support the accounts given to us by the victims.

As a result, we have been unable to meet the Crown Prosecution Service's evidential threshold for us to formally charge anyone in relation to Operation Marksman.

"Critically the investigation found no evidence of organised child sexual exploitation in any part of our community, either geographically or through ethnicity.

"I would like to reiterate while current lines of enquiry have been exhausted, we will never fully close this investigation and I urge anyone with new information to get in touch with us as a priority.

we will investigate all information provided to us.

"We encourage anyone that has been a victim of sexual abuse of any kind to get in touch using the non-emergency line, 101.

you will be treated seriously, you will be provided appropriate support from the police and partner agencies and we will do everything we can to investigate the case fully and bring those that commit such crimes, to justice."

Warning : This article includes graphic content Sky News has spoken to three young women who have made serious allegations, naming their attackers, and providing documents to back up their stories.

Operation Marksman was wound down after a two-year investigation, with police telling the alleged victims they had exhausted all lines of inquiry.

One young woman, going by the pseudonym Sarah, claims to have been raped by 'around 150 men' over a three-year period, mostly in blocks of flats or at hotels in the city, according to Sky News.

It includes photographs of texts from a man threatening to kill her if she does not come immediately and have sex with a number of men.

"I was shocked at what happened," he said.

Describing herself as a 'terrified' and ‘ powerless ’ 13-year-old girl at the time, she said she came across even younger victims : ‘ There were girls as young as primary school ( age ). ’ She recalled being taken to be abused at a flat where she saw a child sitting in her school uniform, 'probably eight or nine years old ', adding : ‘ She was there with her sister, who was a little bit older.

I remember her screaming in that bedroom."

Now aged 19, Sarah was one of several young women who told Sky News they are disappointed the police investigation has stalled.

one of the men- we are referring to as "man a's phone.

however, humberside police said it had not met the evidential threshold to bring the case to court.

The police arrested 34 suspects and say they did digital searches on 150 devices seized, and that phone records did not provide supporting evidence.

detective chief inspector rebecca dickinson told sky news : "( with ) a text message in relation to a threat, which would have got them ‘ over that line ’.

In a series of texts, the girls admit to each other that they were groomed and raped by him.

She attended the next day for specialist plastic surgery and needed an overnight stay.

"She was left with scarring and numbness to her knuckles.

he told the court that he would, in future, muzzle the dog all the time and have it on a lead.

He comes out at least an hour with me.

"I have no intention of making a destruction order for a dog that is actually quite a decent dog."

She told Sky News – whose report the police have said contains inaccuracies – the abuse started after two men showered her with gifts, before one of them eventually forced himself on her saying : 'It's time for you to pay for all the things we ’ ve given you ’.

He also suggested it displays 'coercive control ', adding that evidence provided by other young women making similar allegations represents ‘ significant levels of corroboration ’.

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