The Bosnian State Investigation and Protection Agency arrested Gligor Begovic on suspicion of the torture, sexual abuse and beating of Bosniak civilians at the wartime Batkovic jail camp.
Begovic, a former guard at the Batkovic detention camp near Bijeljina during the war, was arrested on Monday and handed over to the state prosecutor, who will decide whether to demand custody after a hearing.
A trial for wartime crimes at the Batkovic camp is already under way at the district court in Bijeljina.
Former camp guards Djoko Pajic, Petar Dmitrovic, Djordje Krstic and Ljubomir Misic are accused of beating and abusing prisoners, among them civilians, wounded people and prisoners of war, in 1992 and 1993.