The Oslo District Court says it will hear convicted terrorist and mass killer Anders Behring Breivik's case against the Norwegian government in the prison where he's serving a 21-year term.

Breivik, who killed 77 people in bomb and gun attacks in 2011, has sued the government for alleged human rights violations for holding him in isolation at the Skien prison in southern Norway.

Court spokeswoman Irene Ramm on Tuesday said the four-day trial will be held in the prison for security reasons, starting March 15.

Prison authorities have denied that Breivik is being mistreated.

The self-styled anti-Muslim militant was convicted of mass murder and terrorism for attacks against a government building in Oslo and the left-wing Labor Party's youth camp on Utoya island.