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The court in Stara Zagora decreed a measure of "permanent detention" for the five detainees for the murder of a 36-year-old man during the mass fight in Kazanlak.
Among those detained are a woman and a 17-year-old youth.
More than 20 forensic experts have been appointed, Nova TV reported.
In their position, the detainees claim that they acted in self-defense.
A Roma bride ignited the bloody vendetta in Kazanlak
In a three-day period, detainees can appeal the measure.