The court appearance comes as authorities continue to search for possible victims of Friday's bombing in downtown Oslo and a mass shooting at a political youth retreat on Utoya Island. At least 93 people were killed and 96 were wounded in the attacks.

Police have not identified the suspect, but local television and newspaper reports say the man in custody is Anders Behring Breivik.

Attorney Geir Lippestad, who claimed to represent Breivik, told Norwegian TV2 that the suspect feels the terrorist attacks were "horrible," but "in his head (they) were necessary."

During the TV2 interview late Saturday, Lippestad said his client "is ready to explain himself" at Monday's court hearing.

Whether the suspect will be allowed to address the Norwegian court and under what, if any, circumstances is not immediately known.