The man accused of killing 77 people in bomb and gun attacks in Norway last July is due to take to the stand on the second day of his trial in Oslo.
Anders Behring Breivik will read out a prepared statement on Tuesday that will take about 30 minutes, his lawyer said.
He has admitted carrying out a car bombing in the capital before attacking a youth camp organised by the governing Labour party on the island of Utoeya.
However, he has pleaded not guilty to acts of terror and mass murder.
He said he had acted to protect Norway from multi-culturalism and Islam.
On Monday, prosecutors played harrowing recordings of the events and described the fate of each victim in detail.
Throughout the evidence Breivik remained emotionless, although he broke down when the court played a 12-minute anti-Islam video which he had posted online on the day of the carnage.
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