Macedonian border guards fired tear gas and rubber bullets to push back hundreds of people from a fence near the sprawling Idomeni camp.
As many as 300 Bosnians have joined the Islamic State in Iraq and Syria, and security officials fear that few opportunities for Bosnia's young men could lead even more to join violent radical jihadist groups.
Just hours after an agreement aimed at stymieing the flow of migrants into Europe took effect, VICE News saw an overcrowded boat arrive on the Greek island of Lesbos with two lifeless bodies aboard.
Speculation and rumors surrounding the nationalities of the attackers has already stirred up anti-immigrant and Islamophobic sentiment.
Voting in some areas of eastern Ukraine was difficult or altogether stifled, but no major security issues were reported early Sunday as president Petro Poroshenko's pro-Western party was expected to win a majority of seats.