Breivik gives a clenched fist salute before the verdict
The verdict by a five-judge panel at Oslo's district court means the right-wing extremist will be detained in prison for at least 21 years, rather than in a mental hospital.
Today's ruling is the latest chapter of a terror case that has haunted Norway for 13 months after Breivik's attacks left 77 people dead and more than 200 injured.
Breivik, a 33-year-old Norwegian on a mission to expel Muslims from Europe, set off a car bomb that killed eight people outside government headquarters in Oslo, and then killed 69 others in a shooting rampage on Utoya island, where young members of the governing Labour Party had gathered for their annual summer camp.
Judge Wenche Elisabeth Arntzen handed down a sentence of "preventive detention" of at least 10 years and a maximum of 21 years. That confinement option can be extended for as long as an inmate is considered dangerous to society. It also offers more programmes and therapy than an ordinary prison sentence. Norway does not have the death penalty.
Breivik had said he would appeal against an insanity ruling but accept a prison term in Oslo's Ila jail, where he has been held in isolation for most of the time since his arrest.
Prisoners at Ila have access to schooling that offers courses from primary grade to university level courses, a library, a gym, work in the prison's various shops and other leisure activities.Because Breivik is held in isolation, he does not have access to those things.
In compensation, Ila has given him three cells instead of one, each about 86 square feet. One has gym equipment, another has a bed and the third a desk with a laptop computer. For at least an hour a day, he has access to a small courtyard covered by barbed wire.
Breivik can challenge a "preventive detention" sentence every five years. One of the reasons Breivik's attacks were presented in such gruesome detail during the trial was so the horror of Oslo and Utoya would be well-documented for the day Breivik asks to be released.
Breivik wants to be seen as a political terrorist, or as he calls himself, a "militant nationalist". During the trial he said that being sent to an insane asylum would be the worst thing that could happen to him and accused Norwegian authorities of trying to cast him as sick to deflate his political views.
His lawyers say Breivik is already at work writing sequels to the 1,500-page manifesto he released on the internet before the attacks.
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