(CNN) -- Anders Behring Breivik, the man accused of killing 77 people in a bomb and gun rampage in Norway in July, is insane, police said Tuesday.
He was psychotic at the time of the attacks and during 13 interviews experts conducted with him, they said.
He suffers "grandiose delusions" and "believes he is chosen to decide who is to live and who is to die," police announced, saying psychiatrists had found Breivik paranoid and schizophrenic.
He is accused of killing dozens of people in a bomb attack in Oslo followed by a shooting rampage on nearby Utoya island.
Breivik will still be tried to determine whether he committed the murders, police said.
But under Norwegian law, he cannot be sentenced to prison or preventive detention but can be confined to a mental hospital for the rest of his life, police said.
Experts based their decision on 36 hours of interviews with Breivik, police said.
The extension of Breivik's confinement under a compulsory mental health care order will be reviewed by a court every three years, police said. The court will consider whether he still represents a danger to society.
Breivik has not yet been told of the conclusions reached by the experts who evaluated him, police said. His lawyers are expected to relay their findings.
He will have the opportunity to give evidence at his trial, expected to start in April, police said.
Eight people were killed in the bombing in Oslo; 69 young people were killed on Utoya island, in the deadliest attack in Norway since World War II.
Breivik has been held in custody since his arrest on Utoya island on the day of the killings.
CNN's Laura Smith-Spark contributed to this report.
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