Anders Behring Breivik, the Norwegian, who has confessed to carrying out the deadly massacre at a youth camp in Norway and a bombing in the capital Oslo, wanted a change in society, his lawyer said.

"He wanted a change in society and, from his perspective, he needed to force through a revolution," Breivik's lawyer Geir Lippestad told Norwegian media."He wished to attack society and the structure of society."

"He thought it was gruesome having to commit these acts, but in his head they were necessary," Geir Lippestad added.

He added that the actions had been planned for some time.

"He's stated that he went to Utoeya to give the Labour Party a warning that 'doomsday would be imminent' unless the party changed its policies."

Lippestad says the suspect remained calmed and balanced throughout a 10-hour night of interrogation.

"I think he's realized what he's done, and he views himself as sane," he said.

Lippestad said his client had said he was willing to explain himself in a court hearing on Monday.

The court will decide at the hearing whether to keep the suspect in detention pending trial.

Norway has had problems with neo-Nazi groups in the past but the assumption was that such groups had been largely eliminated and did not pose a significant threat, says the BBC's Richard Galpin, near the island which remains cordoned off by police.

At least 93 people were killed in the attacks on the island and the capital - 96 have been injured and some are still missing.

Memorial services are being held across the country, including at the main Lutheran cathedral in Oslo.

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