The lawyer defending Anders Behring Breivik, who admits carrying out Friday's mass killings in Norway, says his client is probably insane.
However he added it was too early to say if Mr Breivik would plead insanity.
The bombing in Oslo and shooting spree on a nearby island killed 76 people. Mr Breivik is facing terrorism charges.
Police are considering also charging him with crimes against humanity, which carry a possible 30-year sentence, a prosecutor has said.
Mr Breivik's lawyer, Geir Lippestad, told reporters: "This whole case indicated that he is insane."
He said his client believed that he was in a war and that he would be vindicated in 60 years' time.
A medical evaluation would be carried out to establish his psychiatric condition, Mr Lippestad added.
He said Mr Breivik had told him he was part of an anti-Islam network that had two cells in Norway and several more abroad.
Norwegian police and researchers have cast doubt on such claims, but said they were investigating them.
Mr Lippestad also said that his client had used "some kind of drugs" before the crime. (more)