Video: Massacre gave mummy's boy sense of satisfaction
The killer's profile suggests a calm loner who used a "slow-burning anger" to plan a meticulous attack, according to a leading criminal psychologist.
Dr Ian Stephen said the gunman's methods were different from the "tantrum" type of killing sprees that occur when a person reaches breaking point.
The forensic psychologist, who profiles serial killers for the police, said the attacks looked like the actions of a man who felt a controlled rage against society and had planned his attack for a long time.
He said: "From everything we know about him, this looks like someone who is extremely disciplined, who has felt a slow-burning anger, which has triggered a kind of revenge attack against the world.
Dr Stephen said the behaviour of Anders Behring Breivik, the suspect in this case, appeared "meticulously planned, and he sticks around afterwards; it's as if he takes satisfaction from seeing the results."
The psychologist said the details known about Breivik -- his background as a Christian fundamentalist, Freemason and his activities in right-wing politics, combined with an interest in body-building -- suggested a "very egocentric, narcissistic and disciplined man" likely to believe that he was always right.
So far, details have not emerged of close friends, with Breivik reportedly living with his mother at the age of 32.
Dr Stephen said: "There is a sense of a kind of mummy's boy -- someone who perhaps couldn't form relationships."
The psychologist described the killer as a "classic loner" who, while keen to promulgate his beliefs, was unlikely to have shared his darkest thoughts with anyone else.
"The impression given [is] of a man who put himself on a pedestal; detached and extremely focused," Dr Stephen added. (© Daily Telegraph, London)