Pictures of children with semen on their bodies, videos of children crying and screaming while being raped.
Hundreds of images that the police found in the young teenager's computer and telephone were, in the opinion of the prosecutor, particularly ruthless.
During questioning, the accused teenager says that he was drawn to such pictures already at the age of 10-12 and that he continues to be interested in people of that age.
"Now he has got it out and it's good and if it had come when he had been type 50, it would probably have gone too far," it says in a transcript from the interrogation in the preliminary investigation report.
It also says that he hopes to get help.
Found in Canadian investigation
The police tracked down the now adult man two and a half years ago, after the Canadian police found a Swedish IP address, which Swedish police could then link to him.
Pictures and videos were found in computers as well as tablets and in his phone.
He already appeared as a 15-year-old in seven sections of the police's suspicion register for, among other things, assault, unlawful threats and harassment.
During questioning, he pleads guilty to child pornography.
The date of the trial has not yet been set.