The mass killer is undergoing psychiatric tests at a prison which was a Nazi concentration camp during the Second World War.
He is being kept in isolation on suicide watch, with a full evaluation of his mental state likely to take up to three months.
Breivik has been described as ‘insane’ by his own lawyer.
But Norway’s domestic intelligence chief Janne Kristiansen told the BBC she believes he is calculating, evil and sought the limelight.
She also rejected his claims that he was part of a wider terror network.
Mrs Kristiansen said she thought he had acted completely on his own and there were no signs he was part of a ‘broader movement’ in Norway or England.
She said: ‘I can tell you, at this moment in time, we don’t have evidence or we don’t have indications that he has been part of a broader movement or that he has been in connection with other cells or that there are other cells.’
Breivik has admitted he was behind the atrocities, but he denies criminal responsibility and has pleaded not guilty to the charges he faces.
He is being held at Ila prison, a former Nazi concentration camp, but may be moved to another maximum security jail. Read More