Anders Behring Breivik smiled with apparent satisfaction when Judge Wenche Elisabeth Arntzen read the ruling, declaring him sane enough to be held criminally responsible and sentencing him to "preventive detention." He's most likely to spend the rest of his life in prison.
The 33-year-old set off a car bomb that killed eight people in Oslo on July 22, 2011, and then gunned down 69 others at a summer camp, most of them teenagers.
After the ruling, Breivik said he wanted to issue an apology, but it wasn't for the victims.
"I wish to apologize to all militant nationalists that I wasn't able to execute more," Breivik said.
Breivik's gruesome and defiant statement Friday marked the end of a legal process that has haunted Norway for 13 months.
The five-judge panel in the Oslo district court unanimously convicted Breivik, 33, of terrorism and premeditated murder and ordered him imprisoned for a period between 10 and 21 years, the maximum allowed under Norwegian law. But such sentences can be extended as long as an inmate is considered too dangerous to be released, and legal experts say Breivik will almost certainly spend the rest of his life in prison.
The Associated Press contributed to this report.