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A "depraved" Derby sex offender and blackmailer, who carried out a shocking catalogue of horrific crimes against 152 young victims, has been branded by a judge as "every parent's worst nightmare".

Judge Shaun Smith KC told convicted rapist Siah Riley he had never encountered such a prolific offender of his kind throughout 46 years in the legal profession.

The 36-year-old defendant posed as teenagers by creating fake profiles on social media and lured girls as young as nine into sending sexual videos and images to him.

When some of his victims refused to comply with his demands, the Normanton paedophile threatened to share the material they had already sent him with the wider online world unless they provided him with more.

When officers finally caught up with the depraved offender, they uncovered how he had meticulously organised the footage and images into files sorted by the names of his victims, reports Derbyshire Live.

Handing him a 31-year sentence, Judge Smith said: "This was depraved. The extent of your obsession with online pornography involving young girls is truly breathtaking.

"You have no moral compass. You are every parent's worst nightmare.

"In my 46 years in this profession, I have never encountered a case with so many offences and so many victims. In one video you told a girl to choke herself so she knew you were in charge."

Leanne Summers, prosecuting, confirmed the offending spanned a two-year-and-eight-month-long period between 2021 and 2023. She said: "This case is about the defendant's prolific use of Snapchat to incite children aged nine to 16 to share with him sexual images and videos.

"The total number of victims is 152. He used two Snapchat accounts.

"One was under the name Josh King in which he pretended to be a teenage boy and another under the name Kim in which he posed as a teenage girl. On each occasion he used Snapchat accounts to request images of a sexual nature.

"His attitude towards them often changed when they became reluctant and he blackmailed 24 victims saying he would share their images online if they did not carry on sending them.

"His method was to use one device to chat to the victims and another device to record what was sent to him. He then moved them to a laptop, storing them there under the names of the victims. It is clear they do not know he was using a separate device to record them.

"When police seized his devices, there were also indecent images of children, including 1,831 images of his victims, which he retained for his own sexual pleasure."

Miss Summers detailed a significant number of examples of the videos and images that the young girls had sent to Riley. Amongst these was a 13-year-old girl who referred to the defendant as "Master" and apologised for "not doing better" for him.

He subsequently blackmailed her, threatening to post the videos to TikTok, Facebook, pornography sites, the dark web and "everywhere he could" if she refused to continue sending them. The prosecutor stated that when another blackmail victim informed him she was only 10 years old, he replied: "I don't care, you are hot."

He also told a third victim that he "hoped her parents would see" the images he was threatening to post on Facebook.

Miss Summers read out a number of victim impact statements in which the young girls told how their personalities had been "destroyed" and how they feel they have "betrayed themselves".

One mother's statement read: "My family will never forgive and forget what you have done because every time I see the scars on my daughter's arms it makes me hate you a little more."

Riley, of Walbrook Road, pleaded guilty to multiple counts of causing or inciting a child to engage in penetrative sexual activity; causing or inciting a child to engage in non-penetrative sexual activity; causing or inciting a child under the age of 16 to engage in penetrative sexual activity; causing or inciting a child under the age of 16 to engage in non-penetrative sexual activity; engaging in sexual communication with a child; causing or inciting a child to engage in prostitution or pornography and 23 counts of blackmail.

His criminal history includes a conviction for rape from 2012, for which he received a six-and-a-half-year prison sentence.

Steve Gosnell, mitigating, said his client had pleaded guilty to the raft of charges at the earliest opportunity.

He said: "He does regret this and he does apologise. He knows he will receive a term of incarceration of many years." In addition to the lengthy custodial sentence, the judge also imposed a lifetime sexual harm prevention order on Riley, along with a permanent place on the sex offender register.

The 31-year sentence is made up of 25 years' custody plus a six-year extended licence.