Relatives, friends and members of the public gathered outside Sofia's courthouse to demand prosecutors and investigators tell the truth about the "Petrohan-Okolchitsa" case. They called the protest "No to lies and vandalism over Petrohan".
The relatives of the six people who died want to see facts and expert reports, which they say are either missing or contradict each other. They oppose turning the case into a political football and reject what they call "unproven psychological theories and hints" spread by investigators.
Organisers said the case has stirred up tension and eroded trust in state bodies. Sofia mayor Vasil Terziev, they said, has again come under attack on his reputation from politically driven people, with no proof behind it. The case, they added, has already sparked political clashes outside Sofia city hall.
On 2 February, the bodies of three people who had been shot were found near the Petrohan mountain hut. Three more people were reported missing soon after, and were found shot dead near Okolchitsa peak a few days later. All six were linked to a non-government organisation whose members lived at the hut.
Investigators are looking into several theories, including murder followed by suicide, or suicide alone.
On 23 September, Slavi Trifonov wrote on Facebook that he had torn down a memorial plaque at the Petrohan pass. "What's on the Petrohan pass is not a memorial plaque. It's a grim mockery of the morals and the laws of our society," he wrote.