Norway mass murderer gets 21 years in prison. Just 21 years?

Anders Behring Breivik, the man who killed 77 people in a bomb attack and gun rampage just over a year ago, was this morning sentenced to 21 years in prison by a Norwegian court.

Breivik, 33, was charged with voluntary homicide and committing acts of terror over the attacks in Oslo and Utoya Island on July 22, 2011.

He killed 77 people and he gets just 21 years in prison?