The former Bosnian army commander, Atif Dudakovic was detained by police on Friday over allegations of war crimes and crimes against humanity committed against Serb civilians during the conflict between 1992 and 1995.
Twelve other members of the Bosnian army were also detained along side Mr Dudakovic, who was a popular army commander in the Bihac region, viewed by many Bosniaks as a war hero.
The detentions follow over 8000 pages of evidence submitted by a team investigating allegations of warcrimes against Serbs.
Mr Dudakovic has previously rejected all the allegations and evidence as fabrications based on political motivations.