The Bosnian Supreme Court has ordered the detention of five former Bosnian officials, including a former interior minister, Bakir Alispahic, on suspicion of terrorism and espionage.
A lawyer for Mr Alispahic is reported as saying his client and the other four officials are to be detained for 30 days.
Mr Alispahic, the former head of the Muslim-led intelligence service (AID) and two former senior AID officials, Irfan Ljevakovic and Enver Mujezinovic, are also charged with abuse of office.
Police allege that the accused co-operated with the Iranian intelligence agency to establish a terrorist training camp in the Bosnian mountains.
The targets are reported to have been political opponents of the Party for Democratic Action (SDA), led by Alija Izetbegovic.