"He admitted responsibility," lawyer Geir Lippestad told the television station on Saturday.
"He explained that it was cruel but that he had to go through with these acts," Lippestad said, adding that the attacks were "apparently planned over a long period of time".
The Associated Press adds:
"He has confessed to the factual circumstances," Breivik's defense lawyer, Geir Lippestad, told public broadcaster NRK. Lippestad said his client had also made some comments about his motives.
"He's said some things about that but I don't want to talk about it now," the lawyer told NRK.
Information about Breivik's motivations have been emerging throughout the day. Apparently, Breivik uploaded a video on YouTube six hours before the bomb in the center of Oslo went off, according to TV2, the Wall Street Journal reports. The video was uploaded by a user called AndrewBerwick on YouTube, and calls for conservatives to "embrace martyrdom."
"[If] the multiculturalist elites of Europe continue to refuse to voluntarily transfer political and military power to our conservative revolutionary forces ... then [the second world war] is likely going to appear as a picnic compared to the coming carnage," the video stated in captions. The video has since been removed from YouTube, but a supposed copy is posted below (note, we cannot confirm this is in fact the video). Pictures that appear at the end of the approximately 12-minute video, called "Knights Templar 2083," also appeared on Breivik's now closed Facebook page, Reuters reports. However, Reuters likewise adds that "it was not possible to verify who uploaded the video, which was posted on July 22 by an Andrew Berwick."