In July 1995 Serbian forces killed more than 8,000[533][534] Bosniaks (Bosnian Muslims), mainly men and boys, in and around the town of Srebrenica during the Bosnian War. The killing was perpetrated by units of the Army of Republika Srpska (VRS) under the command of General Ratko Mladić. The Secretary-General of the United Nations described the mass murder as the worst crime on European soil since the Second World War.[535][536] A paramilitary unit from Serbia known as the Scorpions, officially part of the Serbian Interior Ministry until 1991, participated in the massacre,[537][538] along with several hundred Russian and Greek volunteers.[539]