Mass murderer Anders Breivik has partly won a court case in which he said he was the victim of human rights abuses in prison.

The 37-year-old killer argued his treatment in a Norwegian prison was "inhuman" and "degrading".

Breivik, who is serving 21 years in jail for the 2011 killing of 77 people, sued the Norwegian state over his treatment.

The ruling said the Norwegian state had not violated Breivik's right to a private life and a family life.