Anders Breivik questioned about his obsession with World of Warcraft video game

The prosecution at the trial of Anders Brevik have been questioning him about his obsession with the video game "World of Warcraft".

Between 2006 and 2007, the 33-year-old Norwegian mass killer spent his days and nights immersed in the game's fantasy world of monsters, wizards, and knights performing violent missions.

World of Warcraft - a virtual world where players attempt to achieve the position of "Justicar" - has been criticised for its addictiveness.