The royal palace and the headquarters of the governing Labour Party were on self-confessed Norwegian killer Anders Behring Breivik's list of targets, the tabloid Verdens Gang (VG) reported Saturday.

"During his interrogation, he said that he had planned to attack other targets, but on July 22 it was only the seat of government in Oslo and Utoeya," the island where young Labour Party supporters were holding their summer camp, prosecutor Paal-Fredrick Hjort Kraby was quoted as telling the paper.

According to VG, the royal palace was a target because of its symbolic value, while Labour headquarters were targeted because of the party's role in creating the multi-cultural society so loathed by Behring Breivik.

"I would not like to comment on the number or nature of the targets he had in mind. They are obvious targets for a terrorist and the idea is to hit the government," Hjort Braby said.

Norwegian police could not immediately be reached to comment on the report.

Seventy-seven people were killed in the bomb attack in Oslo and the shootings on Utoeya, for which the 32-year-old extremist has acknowledged responsibility.