Prosecutors in Bosnia are probing a blast at a police station which authorities say could have been an act of "terrorism."
Attackers threw an explosive device on the roof of the building in the central town of Zavidovic early on November 24, causing minor damage but no injuries, according to police.
A police spokeswoman said that the "case has elements of the criminal act of terrorism."
The national prosecutor's office has taken over the case and formed a special team tasked with investigating.
The incident comes less than a week after two military men were killed on November 18 by a man who attacked them with automatic weapons near a barracks in Sarajevo before blowing himself up.
Authorities have said that the perpetrator had links to Islamist circles and that the attack was almost certainly a "terrorist act."
Muslims make up about 40 percent of Bosnia's 3.8 million people.
The vast majority of Bosnian Muslims are moderates, but a tiny minority supports radical Wahhabism.