The Oslo district court says it will announce its ruling Wednesday on mass killer Anders Behring Breivik's lawsuit against the government for alleged human rights violations.

The right-wing extremist was convicted of terrorism and mass murder for 2011 bomb and gun attacks in Norway that killed 77 people.

Breivik claims his prison conditions violate the European Convention on Human Rights. At court hearings in Skien prison in southern Norway last month, he complained that prison authorities won't let him communicate with or receive visits from other right-wing extremists.

Government lawyers dismissed his complaints, saying Breivik remains a dangerous inmate who could inspire others to commit similar attacks.

The court says it will issue its decision in a written statement at 1300 GMT on Wednesday.