Fjotolf Hansen (born 13 February 1979), better known by his birth name Anders Behring Breivik (Norwegian pronunciation: [ˈɑ̂nːəʂ ˈbêːrɪŋ ˈbræ̂ɪviːk]) and by his pseudonym Andrew Berwick, is a Norwegian far-right domestic terrorist, known for committing the 2011 Norway attacks on 22 July 2011. On that day, he killed eight people by detonating a van bomb at Regjeringskvartalet in Oslo, then killed 69 participants of a Workers' Youth League (AUF) summer camp in a mass shooting on the island of Utøya.