Bulgarian authorities say that after months of investigation they have busted the “most powerful hacker group” in the country, the Cyber Warrior Invasion. The operation was conducted by Bulgaria’s Sector for Computer Crimes, Intellectual Property and Gambling and the territorial units of the Chief Directorate for Fight with Organized Crime in the municipalities of Pleven, Shumen, Plovdiv, Burgas, Haskovo, Stara Zagora and Kyustendil.