Oslo: Anders Behring Breivik was under the influence of illegal drugs when he carried out the July 22 twin attacks in Norway, killing 77 people, police said Monday.
"I can confirm that he had used illegal drugs. I do not want to comment on what kind of products, but he had consumed some," police prosecutor Paal-Fredrik Hjor Kraby said, saying the conclusion was based on blood test results.
In the 1,500-page manifesto he posted online shortly before carrying out the attacks, the 32-year-old rightwing extremist said he had been using anabolic steroids.
On July 26, his lawyer Geir Lippestad had also said his client had used drugs to keep him "strong, efficient and awake" as he bombed government offices in Oslo then went on a shooting rampage on the nearby island of Utoeya, where the ruling Labour Party`s youth organisation was hosting a summer camp.
"It`s obvious he used steroids, but he also used other drugs, which I don`t want to elaborate on," Hjort Kraby said Monday.
The police prosecutor also said that the two psychiatrists appointed to evaluate Behring Breivik`s mental state in order to determine if he is fit to stand trial and can be held accountable for his actions had begun their work.
Police had already provided the two experts with elements from the killer`s file and tapes of the three police interrogations held with him since he was arrested on Utoeya, where he massacred 69 people, many of them teens, Hjort Kraby said.
"They will soon begin interviewing him. That should happen this week" in the Ila high security prison, near Oslo, where he is being held, he added.
The two psychiatrists are scheduled to hand over their report by November 1.