On 27 April 2015 , local Nerdin Ibrić ( born 1991 ) , a radical Islamist , attacked a police station in Zvornik . He killed one police officer and wounded two others before he was shot dead by other police officers . Soon after Ibrić 's two friends were arrested , the police expanded its investigation to include other radical Islamists , some of whom were also veterans of the Syrian Civil War . The police suspect that the village of Dubnica near Kalesija is one of the major gathering points of radical Islamists . Soon after the attack , Dodik met with Serbian President Tomislav Nikolić and Prime Minister Aleksandar Vučić , asking them for intelligence and counter-terrorism assistance
attacked a police station
Zvornik police station shooting
Operation Ruben