Serbia's police

Also this morning, reports of planted bombs were received at primary and secondary schools throughout Belgrade, and the police carried out checks at those locations. Children and employees have been evacuated from schools, and while some are waiting to return to classes, some schools have sent notices to parents to pick up their children.

Police in Bosnia's mainly Serbian Republika Srpska entity and Sarajevo Canton have received emailed threats targeting schools.

On Wednesday, several police units in Republika Srpska and Sarajevo Canton received the threatening emails containing bomb threats to elementary and high schools.

Tensions soared Monday at the border between Kosovo and Serbia as Kosovo deployed additional police to implement a rule to remove Serbian license plates from cars entering Kosovo, while Serbs protested the move, AP reports.

Serbia's police led by Interior Minister Aleksandar Vulin have recently conducted several high-profile actions, hotly followed by the media, tackling refugee and migrant smuggling.

On Sunday, police said they discovered an illegal migrant camp near the borders with Hungary and Romania and detained suspected people smugglers.

BELGRADE - Serbia's Police Director Milorad Veljovic and representatives of the Kosovo police will discuss integration of Serb police officers from the southern Serbian province in the Kosovo police structure, Serbian Interior Minister Nebojsa Stefanovic said Tuesday.

Kosmajac was arrested in his home in Belgrade on Sunday, alongside seven other people who work with him, on suspicion of tax evasion and other offences.

BELGRADE - Five percent of Serbia's police force is on strike, Interior Minister Nebojsa Stefanovic said on Monday, adding that most police officers were doing their job on Sunday by securing the Pride Parade in Belgrade.