Paedophile and Lostprophets frontman Ian Watkins has "hundreds of victims", his former girlfriend says.
Joanne Majic, a 38-year-old call girl, had an on-off relationship with Watkins but dumped him four years ago when he told her his sexual fantasies revolved around child abuse, the Daily Mail reported.
The former lead singer of the British rock band also told her he used his fame to lure fans into handing over their young children for him to abuse.
"I've always said to the police, there's hundreds of victims out there and you're never going to find them because the mothers are in on it," Majic said.
She said she went to police after he told her he wanted to have sex with a child, but they ignored her.
When she learned Watkins had been arrested one year ago, she said she told police: "'You're four years too late', because if they'd done something in 2008 he never would have done anything."
The British Independent Police Complaints Commission is now investigating to see if police acted quickly enough, BBC News reported.
The police chief leading the inquiry, Detective Chief Inspector Peter Doyle, has described it as "the most shocking case I have ever seen." He has called for any other victims to come forward.
Watkins, 36, yesterday pleaded guilty to a series of sexual offences, including trying to rape a baby.
He was arrested last December and charged with more than 20 offences, including raping a baby, conspiring to sexually assault a child and making indecent images.
He had denied the charges but changed his plea in Cardiff Crown Court and admitted 11 offences, including sexually touching a 1-year-old, encouraging a groupie to abuse her child and making child pornography.
Watkins would be sentenced on December 18.
Lostprophets - which formed in 1997 and had a chart-topping album in 2006 with Liberation Transmission - announced it was disbanding after Watkins' arrest.