Oslo (AFP) - The father of Norwegian mass murderer Anders Behring Breivik will publish a book in October entitled "My Fault? A Father's Story" on his role in fathering a killer, his publisher announced Wednesday.
"I feel some guilt and I feel some responsibility. What would have happened if I had been a better father? Would Anders have done what he did?" writes Jens Breivik in an excerpt of the book released by the publisher Juritzen.
His son is serving a 21-year jail sentence, which can be extended, for the murder of 77 people in Oslo and the island of Utoeya in July 2011 -- most of them adolescents at a summer camp.
Jens Breivik -- a former diplomat who moved to France when he retired -- has often been described as an absent father, as he was separated from his son's mother shortly after the boy turned one and lost contact with him when he was a teenager.
During the murder investigation and trial it emerged that Norwegian social services had suspected Breivik was neglected at home as a child. At the time his father had attempted to win custody over him but failed.
Written with the help of a ghost writer, the book is a form of "self-trial" according to its editor Arve Juritzen who said that Jens Breivik re-established contact with his son this year.
"In fact he is pretty hard with himself," he said.
Another book about Breivik's late mother Wenche Behring Breivik -- which she first collaborated on but later rejected -- portrayed Jens Breivik as a domestic tyrant.