Mediation talks reportedly failed over Kosovo's refusal to accept a compromise plan. The EU initiated the meeting seeking to normalize relations between the uneasy neighbors, both of whom hope to join the bloc.
Kosovo's prime minister said he was relieved that his officers were back with their families, but called for Serbian "aggression" to be held to account.
Following the arrest of three Kosovar officers in Serbia, the US has repeatedly called for their release. But public prosecutors are pushing ahead with charges, further raising tensions.
Protesters returned to the streets as President Aleksandar Vucic ignored their calls to resign. The latest rallies come amid public anger following two deadly mass shootings.
Clashes broke out as demonstrators tried to prevent a newly elected ethnic Albanian mayor from entering his office in the Kosovar town of Zvecan. A police car was set on fire and tear gas was used to disperse the crowd.
Tens of thousands of people have taken to the streets of Belgrade for a third time to protest over violence. Protesters are calling for the resignation of the interior minister and the head of intelligence.
Serbians took to the streets to demand better security and the resignation of top officials after two mass shootings, including one at a school, in recent days.
Police have arrested a man suspected of killing eight people in the second mass shooting in Serbia in just two days. They hunted for the attacker as the country mourns.
More people have been killed in a second gun attack in Serbia, immediately after a bloodbath at a school in Belgrade. The country is in shock, and its people are casting about for reasons.
The leaders of the Balkan nations gave their tacit approval to a European peace plan in February and discussed steps to implement the plan in March. The question of Kosovo's statehood remains the most contentious issue.
A host of gun control measures were announced after a teenager killed eight fellow students and a security guard in a school shooting. Gun owners have been warned to keep their weapons locked up.
The Kosovo war remains a thorny issue in the relationship with Serbia. Experts think the trial in The Hague is one-sided and could exacerbate tensions between the two sides.