The investigation will be led by High Court judge Musika Dujovic, who has not yet scheduled a hearing of the suspects, Republika newspaper wrote on Wednesday.
After hearing the suspects, Dujovic would decide whether to initiate an investigation or not.
According to a statement from the High Court, the six persons, identified only by their initials, are suspected of violating international law by having committed war crimes against civilians and prisoners of war in the Morinj camp near the coastal resort of Kotor between October 3, 1991 and July 2, 1992.
The suspect identified as M. G., acting as an interrogator, ordered acts of torture and other inhumane acts against civilians and prisoners of war, while the other suspects carried out his orders, the request for investigation said.
Croatian civilians and prisoners of war were brought to the JNA detention centre from the Dubrovnik area and held there in contravention of the Geneva conventions.
According to the newspaper, prosecutors proposed hearing over 50 witnesses during the investigation.
Montenegrin prosecutors filed the request for investigation on July 7, ten days after Chief Public Prosecutor Vesna Medenica said she had problems with the evidence in the case.
Medenica said then that the evidence provided by Croatia was good, but that she would not accept it because it was based on testimonies given 15 years ago.
"We don't want to take people before a court on the basis of something that someone testified before Croatian courts 15 years ago. They will have to come to Montenegrin judicial authorities to identify the perpetrators and then go to court with hard evidence," Medenica said.
Hague Tribunal Chief Prosecutor Carla del Ponte said in Podgorica on Monday she was willing to help Montenegro in gathering evidence not just in the Morinj case but in all other war crimes cases in Montenegro.
Del Ponte and Medenica are due to meet on the northern Croatian Adriatic archipelago of Brijuni later this month at a conference of prosecutors from the region, when they are to discuss the matter in greater detail.