Anders Behring Breivik is a Norwegian neo-Nazi, mass murderer, and domestic terrorist who perpetrated the 2011 Norway attacks. A believer in the Great Replacement conspiracy theory, he sought to combat perceived "Cultural Marxism" by detonating a car bomb at the Regjeringskvartalet in Oslo, then carrying out a mass shooting at a summer camp of the Labour Party's youth wing on the island of Utøya, in total killing 77 people and injuring over 323.