Court-appointed psychiatrists have concluded that Norwegian mass killer Anders Behring Breivik is criminally insane, tabloid VG reported on its website on Tuesday, and could be committed to a psychiatric institution indefinitely rather than face a jail term.

Breivik has confessed to killing 77 people in a bombing in central Oslo and in a shooting spree at a Labour Party summer camp on an island in July, in the worst ever attacks committed in Norway since the end of World War Two.

(Reporting by Gwladys Fouche; Editing by Balazs Koranyi)