Armenia filed a case at the International Court of Justice alleging breaches by Azerbaijan of an international convention that aims to eliminate racial discrimination, the court announced late Thursday.

Armenia alleges that as a result of what it calls a “State-sponsored policy of Armenian hatred, Armenians have been subjected to systemic discrimination, mass killings, torture and other abuse,” the court said.

The case centres of the Nagorno-Karabakh region of Azerbaijan that has been under the control of ethnic Armenian forces backed by the Armenian government for more than a quarter of a century.

During the Soviet era, the predominantly Armenian-populated region had an autonomous status within Azerbaijan. Long-simmering tensions between Christian Armenians and mostly Muslim Azeris boiled over as the Soviet Union collapsed. Conflict broke out in 1988 when the region tried to join Armenia, and escalated into war after the 1991 collapse of the USSR, leaving an estimated 30,000 dead and displacing about 1 million.

Fighting that erupted again a year ago killed hundreds, making it the biggest flare-up in the conflict since 1994.

Armenia alleges that Azerbaijani committed “grave violations of the racial discrimination convention” during last year’s fighting.

The Armenian case says that even after a Russia-brokered ceasefire came into force on Nov. 10, “Azerbaijan has continued to engage in the murder, torture and other abuse of Armenian prisoners of war, hostages and other detained persons,” according to the court.

Azerbaijan is expected to file a similar case against Armenia next week at the world court.

Leila Abdullaeva, head of the Azerbaijan foreign ministry’s press department, alleged Friday that, since the ceasefire, Armenia has prevented Azerbaijanis from returning to their homes through indiscriminate mining of the former occupied territories and refusing to provide mine maps to Azerbaijan.

In its case, Armenia also asks the court to urgently order so-called “provisional measures” to protect the country and Armenians “from further harm, and to prevent the aggravation or extension of this dispute” while the case is handled by the court.

The world court, formally known as the International Court of Justice, deals with dispute between nations. Cases often take years to be resolved.