Six people have been found dead on a mountain range in western Bulgaria, officials said.
Three bodies, including that of a 15-year-old, were found on February 8 in a van parked in a remote part of Stara Planina.
Investigators said the case was linked to another that occurred six days earlier, when the bodies of three men were found near a burned-out cabin.
Surveillance camera footage shows two groups saying goodbye to each other in the cabin.
Three other people remained at the scene and were later filmed setting the cabin on fire, police said.
In this case, there are "disturbing details" as in Twin Peaks series - a drama about a murder investigation in an American town in a forested area near Canada, said Borislav Sarafov, Bulgaria's acting prosecutor general.
It is likely a murder-suicide or suicide, prosecutors said.
The police chief called the case an "unprecedented crime" never before seen in the country. Member States of the European Union.
Three men, aged 45, 49 and 51, were found dead near a burnt-out hut on February 2, local media reported, citing the Bulgarian Interior Ministry.
All had gunshot wounds and “there were no signs of a struggle” or other injuries, Nataliya Nikolova of the Appellate Prosecutor’s Office in Sofia told reporters.
Forensic experts determined that the shots were fired at close range.
Two pistols and a rifle were found at the scene near the Petrokhan mountain pass, about an hour from the capital Sofia, Reuters reported.
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Six days later, police officers found the bodies of two men and a 15-year-old boy in a parked camper near the peak of Okolčica, on Mount Vraca, part of the Balkan Mountain Range.
"The discovery of the bodies of these people is linked to the Petrohan case," Zaharie Vascom, the head of the national police, told reporters.
They had gunshot wounds that appeared to have been fired from inside the vehicle, he added.
Prosecutors later said autopsies indicated there were likely two murders and one suicide.
Most of the victims were active in a conservation NGO, officials said.
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