Mass murderer Brevik becoming 'more extreme' in prison, father fears

The father of Norwegian mass killer Anders Behring Breivik said he fears his son is becoming even more extreme and dangerous in prison.

In his first news conference since the 2011 attacks that killed 77 people, Jens Breivik said he had requested to visit his son at the Oslo prison where he is serving a 21-year sentence that could be extended indefinitely.