Investigators identified the alleged perpetrators after they were alerted by their colleagues, said Dragan Lukak, interior minister of Bosnia's Serb-run entity.
"The first clues came from the special police unit itself where the suspects' strange behaviour was noticed," he told reporters.
The unit is tasked with handling terrorism and organised crime.
The armoured car was attacked four months ago on a highway in the north of the country as it headed towards the Croatian capital Zagreb.
A total of seven people have been arrested so far, including an employee of a security firm who likely informed the attackers of the vehicle's movements, local RTRS radio reported.
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