A Sydney man is facing charges of crimes against humanity after the Croatian government found evidence linking him to the massacre of 43 people during the Balkans conflict in 1991, where local fighters and civilians had their throats slit en masse.

The Special War Crimes Investigations Unit in Croatia say 59 year old Zoran Tadic was the leader of a Serbian paramilitary unit at the time of the massacre.

If Australia honours Croatia’s extradition request Mr Tadic will be the first Australian citizen to be extradited over war crime allegations.