A Roma teenager died in a mass brawl in the town of Samokov, 35 kilometres south of capital Sofia.
The police are still investigating the incident and four people have been detained for questioning.
Initial reports claim two groups of teenagers got into a verbal fight around 11 pm on Tuesday, which escalated into a mass brawl.
Two people were injured, with one of them, the 17-year-old Roma, dying before the ambulance arrived on the spot.
Although the initial reports said the brawlers were split along ethnic lines, with Roma fighting against Bulgarians, the police have refuted these claims.