Authorities say an explosive device was thrown at the police station in the northern Bosnian town of Zavidovici but caused minimal damage and no casualties.
Bosnia’s state prosecution office – which is in charge of investigating possible terrorism – has taken over the investigation from the local police, said spokesman Boris Grubesic on Tuesday.
The device was thrown shortly after midnight. Local media reported that schools are closed in the town.
Bosnia is still recovering from an attack last week in Sarajevo when a man killed two soldiers and injured three civilians in a shooting spree before blowing himself up.