Serbian Prime Minister Aleksandar Vucic on Saturday affirmed his commitment to reconciliation with Bosnian Muslims after a stone-throwing mob chased him from a ceremony marking the 20th anniversary of the Srebrenica massacre.

"I regret that something like this has happened. I regret that some did not recognize our sincere intention to build a sincere friendship between Serbs and Bosniaks (Muslims)," Vucic told reporters upon his return to Belgrade. "My hand remains outstretched (to Bosnian Muslims) and I will continue with my policy of reconciliation" between the two Balkan nations, he said.

Bosnia commemorates Saturday the 20th anniversary of the massacre of some 8,000 Muslim men and boys in the U.N.-protected enclave of Srebrenica, as debate continues to rage over its description as genocide.

The remains of 136 newly-identified victims will be laid to rest along with more than 6,000 others already buried at a memorial center just outside the eastern Bosnian town.

As the top Bosnian Serb leaders of the time, Radovan Karadzic and Ratko Mladic are the alleged chief architects of the Srebrenica massacre. But, 20 years on, they have yet to be sentenced for Europe's worst atrocity since World War II.

Karadzic, the Serbs' political leader during Bosnia's brutal 1992-1995 civil war, and his military chief Mladic were both on the run for years before their separate arrests.

Survivors of the Srebrenica massacre set out with thousands of others Wednesday on a solemn 105-kilometer march ahead of the 20th anniversary of the killing of nearly 8,000 Muslims near the U.N.-protected enclave.

Their route across Bosnia retraces the one taken by the men and boys fleeing Bosnian Serb forces who later overran Srebrenica, setting the stage for what many describe as a genocide.

The U.N. Security Council was headed for a showdown Tuesday over a draft resolution that would formally recognize the Srebrenica massacre as genocide, after Russia threatened to use its veto.

As Bosnia prepares for somber national commemorations of the 20th anniversary on Saturday, the 15-member council was to vote on a text that condemns the killing of some 8,000 Muslim men and boys by Bosnian Serb forces in July 1995.

A former Bosnian Serb soldier was acquitted Thursday of charges he helped kill hundreds of Muslims during the Srebrenica genocide, just about a week before commemorations of the massacre's 20th anniversary.

Aleksandar Cvetkovic was tried by a Bosnian court.

Switzerland on Thursday authorized the extradition of former Bosnian Muslim commander Naser Oric to Bosnia rather than Serbia, which had issued the war crimes warrant for his arrest.

Oric, who led Muslim forces in Bosnia's east during its 1992-1995 civil war, was arrested on June 10 in Geneva, accused of war crimes and crimes against humanity against ethnic Serbs during the conflict.

Serbia's premier Aleksandar Vucic, moving to improve ties with Bosnia, said Friday that he was ready to go to Srebrenica to honor the memory of 8,000 Bosnian Muslims killed by Bosnian Serbs two decades ago.

"As the prime minister of the Serbian government I'm ready to bow and pay respect to innocent victims of Srebrenica" who died in July 1995 in the most gruesome chapter of Bosnia's 1992-1995 war, Vucic told reporters.

Slovenia on Friday allowed a former prime minister of Kosovo to return home, after he was held there on an Interpol warrant issued by Serbia, his party said.

Ramush Haradinaj was "expected to arrive in Kosovo during the day," the opposition Alliance for the Future of Kosovo (AAK) said.

Kosovo lawmakers voted a resolution Thursday demanding Slovenia unconditionally return a former Kosovo prime minister held there on an Interpol warrant issued by Serbia.

The resolution said Kosovo's government and president "urgently require the Slovenian authorities to immediately return (his) diplomatic passport and unconditionally allow the return" of Ramush Haradinaj to Kosovo.