Norwegian killer's mother 'sexualised, smacked' him when he was four

Norwegian mass killer Anders Behring Breivik's mother ‘sexualised' her four-year-old son, smacked him and often told him she wished he were dead, a new book on the right-wing extremist has claimed.

Anders Behring Breivik was sentenced to 21 years in prison earlier this year for killing 77 people in a bomb and gun attack (Pic-AFP)

Child psychologist reports printed in the book ‘A Norwegian tragedy', said that when Breivik was just four-years-old, his mother became preoccupied with fears that her son would violently assault someone.

The psychologist reports show that Wenche Behring already felt her son was ‘aggressive, hyperactive and clingy,' when she was breastfeeding him.

"She saw him as an adult violent person, even though he was only a small boy. She was afraid that he would assault people," said Aage Borchgrevink, author of the book.

According to the psychologists, by the time he was four years old, she ‘sexualised' him and hit him.

"The mother and Anders sleep in the same bed at night with very close bodily contact," psychologists from Norway's centre for child and youth psychiatry, reported.