Dragicevic Protesters Camp Before Bosnian Serb Police HQ

Several hundred people led by Davor Dragicevic, father of David Dragicevic - the young man killed in March in unsolved circumstances - spent Wednesday night in front of the police department in Banja Luka, the main city in Bosnia's Serb-dominated entity, demanding to know who killed the 21-year-old.

Protests have been held daily since March in the centre of Banja Luka, the administrative centre of Republika Srpska.

However, on Wednesday evening they relocated to the front of the city police department, after one person allegedly threatened Davor Dragicevic by grabbing him.

RS police said that they had arrested Djordje Marinkovic from the northern town of Brcko for threatening behaviour.

Dragicevic, meanwhile, on Thursday repeated his claim that police and other officials in the entity were involved in the unexplained death of his son.

"David was killed by members of the RS police, here in this building. The killers are still at large," he told a TV station, urging police officers to take off their uniforms and join the protests.

"There will be no sleep until we catch the criminals and killers. We have decided that 6pm on September 25 is the deadline after which we are going to hunt down the criminals and killers," he said.

"We have everything - the names, surnames, phone numbers, communications from people in the RS police," Dragicevic added.

He said he and his "Justice for David" group will remain in front of the Banja Luka Police Department and continue their rallies on the city's Krajina Square until police finally resolve the case.

David Dragicevic's body was discovered in late March in shallow water in the river Crkvena, not far from the centre of Banja Luka.

Police in the entity have failed to...