The National Police operation was conducted in Pernik, a town where a number of dead bodies had recently been found.
According to Bulgarian English-language news source Novinite, the group is believed to have killed at least seven individuals. Police found human remains believed to belong to at least three victims.
The operation nabbed organization ringleaders Vasil Vasilev and Milcho Petrov. Vasilev was heavily armed and armored when arrested with multiple firearms and bladed weapons
The group is believed to have dealt drugs and carried out contract killings for nearly a decade.