Anders Behring Breivik ( ; born 13 February 1979 ) , since 2017 legally Fjotolf Hansen and also known by his pseudonym Andrew Berwick , is a Norwegian far-right terrorist who committed the 2011 Norway attacks . On 22 July 2011 , he killed eight people by detonating a van bomb amid Regjeringskvartalet in Oslo , then shot dead 69 participants of a Workers ' Youth League ( AUF ) summer camp on the island of Utøya . In July 2012 , he was convicted of mass murder , causing a fatal explosion , and terrorism . Breivik was arrested as a juvenile and rejected from the Norwegian Armed Forces . At the age of 20 he joined the anti-immigration/right-wing Progress Party , and chaired the local Vest Oslo branch of the party 's youth organization during 2002 . He left the Progress Party in 2006 and went on to join a gun club and the Freemasons while also founding a company which he used to finance his planned terrorist attacks . On the day of the attacks , Breivik electronically distributed a compendium of texts entitled '' 2083 : A European Declaration of Independence '' , describing his militant ideology . In them , he stated his opposition to Islam and blamed feminism for a European " cultural suicide . " The text called for the deportation of all Muslims from Europe and Breivik wrote that his main motive for the attacks was to publicize his manifesto
2011 Norway attacks
2011 Norway attacks
Anders Behring Breivik