The first wave of massacres Killing in the town began Process_start on 11 or 12 May 1941 , when a band of Ustaše led by Mirko Puk murdered Killing a group of Serb men and boys in a Serbian Orthodox church before setting Placing it on fire Damaging .

The killing Killing was committed Commitment by a local paramilitary group known as Mirko 's Chetniks and by the Serb Volunteer Guard ( SDG , also known as Arkan 's Tigers ) , a Serbia-based paramilitary group led by Željko Ražnatović ( aka Arkan ) .

The killings Killing were ordered Arranging by the Secretary of Lika Crisis Headquarters , Tihomir Orešković , and the commander of the 118th Infantry Brigade of the Croatian National Guard , Lieutenant Colonel Mirko Norac .