Authorities are investigating whether the attack was related to smuggling or tensions between Serbia and Kosovo.
The situation in Bosnia is no longer a political crisis, but a rapidly deteriorating security crisis.
Europe needs to create and integrate a genocide prevention strategy to keep history from repeating itself in the Balkans.
Brcko was home to some of the first war crimes in the 1990s and a recent announcement to secede is a warning shot that things could go south again.
Bosnian Serb leadership are establishing new facts on the ground that could pave the way for secession in the future.
The move comes after Kosovo deployed police to the area after its government last Monday decided to require drivers with Serbian registration plates to put on temporary ones when entering Kosovo.
The car registration office in the town of Zubin Potok was set ablaze and two hand grenades were thrown at the civil registration office in the town of Zvecan.
More than three-quarters of the vote has been counted in a referendum on whether to keep January 9 as a national holiday despite a ban issued by Bosnia's Constitutional Court.
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