Description:The trial of accused mass murderer and anti-Islamist Anders Behring Breivik enters its third day in Oslo. The Norwegian national is charged with gunning down 69 people at a summer camp last year, as well as killing another eight in a bomb blast. A witness for the defence, sociologist and professor Thomas Hylland Eriksen, says Breivik cannot tell the difference between reality and the computer games he played.(1:59)