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The former singer with the rock band Lostprophets Ian Watkins has been sentenced to 29 years in jail for a string of child sex offences.
Those offences, according to the judge in the case, plumbed new depths of depravity.
A mother from Doncaster was sentenced alongside Watkins for allowing him to abuse her child. South Yorkshire Police is now being investigated for its handling of the case. This report from Grace Melody-Gardner.
The detective leading the investigation into Ian Watkins says the evidence was the 'most disturbing' he has seen in his career.
Police are urging anyone affected by the case to contact them on 02920 634184 or the NSPCC on 0808 800 5000.
Suzanne Thomas, senior Crown Prosecutor at CPS Wales, speaking after the sentencing Watkins was the "ringleader" of a "terrible conspiracy" to commit "appalling crimes of abuse against young and defenceless victims."
South Wales Police say that the sentencing of Ian Watkins today does not mark the end of their investigation into his offences and they will continue to work to identify victims and witnesses.
Nicola Bowes, forensic psychologist at Cardiff University, told ITV News that these types of offences are rare, but have a 'devastating' for the families involved.
The judge told Watkins, who had lost his initial cockiness and was shaking visibly, that he would serve 29 years in jail with the final six on licence.
His two accomplices, Woman A and Woman B, were jailed for 14 years and 16 years respectively.
The judge told Watkins: "Those who have appeared in these courts over many years see a large number of horrific cases. This case, however, breaks new ground.
"You, Watkins, achieved fame and success as the lead singer of Lostprophets.
You had many fawning fans. That gave you power. You knew you could use that power to induce young female fans to have help satisify your insatiable lust and take part in the sexual abuse of their own children.
"Away from the highlights of your public performances lay a dark and sinister side."
A Doncaster mother has been sentenced to 14 years in prison for her part in aiding paedophile rockstar, Ian Watkins, in a string of child sex abuses.
Watkins was sentenced to 29 years for a string of child sex offences including the attempted rape of a baby.
Lostprophets lead singer Ian Watkins has been sentenced to 35 years in jail for a string of sexual offences against children.
He will have to serve two thirds of his 35 year sentence before he can be considered for release.
His co-defendants, "mother A" and "mother B" were sentenced to 14 years and 16 years respectively.
In his summing up comments ahead of sentencing, the judge said Ian Watkins and his co-defendants committed "sickening and incomprehensible" crimes.
The details of the offences, many of which have been two graphic to report, were condemned in the strongest possible terms by the judge, as he reflected on how the singer used his power and celebrity to "partake in insatiable lust."
Latest ITV News reports
A judge has labeled a Doncaster mother's abuse of her own child with Ian Watkins as the "greatest betrayal" a mother can allow.
Ex-bandmates of paedophile Ian Watkins said they were "heartbroken, angry and disgusted" by him, and were unaware of his child abuse.