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STORY: Vucic told Reuters that Belgrade condemned the killing of the policeman, adding Serbia "will launch proceedings before appropriate judicial bodies" and investigate suspects.

He accused Kosovo police of shooting dead one of the gunmen in the head "from the distance of a meter" after he had surrendered, describing it as an "execution."

No group has come forward to claim responsibility for the attack or explain the motives of the gunmen.

Vucic denied allegations from Kosovo's President Vjosa Osmani that Belgrade had incited the violence, saying Serbia would not benefit from it as that would jeopardize its position in EU-sponsored talks with Pristina.

Vucic pledged Serbia would investigate the origin of weapons seized after the incident by Kosovo police, who have displayed a cache including assault rifles, machine guns, anti-tank rocket launchers, hand grenades, land mines and drones.

He also said Milan Radojcic, one of the top-ranking Kosovo Serb politicians who, according to authorities in Pristina, was present during the gunbattle would be "summoned by the prosecutor."

Kosovo police fought around 30 heavily armed Serbs who barricaded themselves into the Serbian Orthodox monastery in the village of Banjska for hours on Sunday (September 24). Three attackers and a Kosovo Albanian police officer were killed in the skirmishes.

Some 50,000 Serbs who live in north Kosovo do not recognize Pristina institutions and see Belgrade as their capital. They have often clashed with Kosovo police and international peacekeepers, but the weekend's violence was the worst in years.