A paedophile who hosted a global child abuse chat room has been jailed for an indefinite period.
McIntosh was placed on the sex offenders register indefinitely
Gordon McIntosh, 33, of Welwyn Garden City in Hertfordshire, was arrested after answering a trick advert placed by police, Luton Crown Court heard.
He pleaded guilty to the making, downloading and distribution of indecent images.
Judge Richard Foster said McIntosh was a public danger and must stay in prison it was decided it was safe to free him.
Before McIntosh's arrest, detectives closed down a paedophile website and arrested its original operator, the court heard.
They then e-mailed users asking for volunteers to run the site, and McIntosh stepped forward, which led to him being detained.
The site had thousands of users worldwide and contained images of the most severe abuse of children.
The judge said the images were "sickening".
Det Ch Insp Liz Hanlon from Herts Police said of McIntosh: "He had never been arrested before. He was very shocked when we came into his house."
His name had been given to Hertfordshire Police by specialist officers who were working with Suffolk Police investigating Timothy Cox, who was also given an indefinite prison sentence at Ipswich Crown Court last week.
McIntosh will also be placed on the sex offenders' register indefinitely.