Serbia's Prime Minister has been chased from a ceremony to mark the 20th anniversary of the Srebrenica massacre by an angry crowd.
Aleksandar Vucic had just laid a flower at a monument to thousands of victims buried there when the crowd started to boo and chant 'Allahu Akbar' (God is Great).
They then hurled stones and other objects including water bottles, forcing Mr Vucic to run for cover shielded by his bodyguards.
Serbia's Tanjug state-run news agency said the former ultra nationalist was hit on the head by a stone and had his glasses broken.
The country's interior minister Nebojsa Stefanovic has described the attack as an "assassination attempt" and "scandalous".
"Bosnia has failed to create even the minimal conditions for the safety of the prime minister," he said.
Mr Vucic, whose country backed Bosnian Serbs during and after the 1992-95 war in Bosnia, was among numerous dignitaries and tens of thousands of people attending the commemoration.
Shortly before arriving, he condemned the "monstrous crime" in Srebrenica, where some 8,000 Muslim men and boys were murdered by Bosnian Serb forces.
Many Serb nationalists still refuse to accept it was a genocide.
Earlier, former US president Bill Clinton had praised Mr Vucic for attending:
Steve Crawshaw from Amnesty International says around a thousand bodies still have not been found:
The United Nations declared Srebrenica a safe haven for civilians, but on 11 July, 1995, Serb troops overran the Muslim enclave.
Some 15,000 men tried to flee through the woods toward government-held territory while others joined the town's women and children in seeking refuge at the base of the Dutch UN troops.
The outnumbered Dutch could only watch as Serb soldiers rounded up about 2,000 men for killing and later hunted down and killed another 6,000 men in the woods.
So far, remains of some 7,000 victims have been excavated from 93 graves or collected from 314 surface locations and identified through DNA technology.
The UN Secretary General has described the massacre as the single worst atrocity on European soil since the Second World War.
Foreign Affairs Minister Charlie Flanagan has called it one of the most appalling atrocities to take place in Europe, and says any attempts to minimise or deny the genocide that took place should be condemned.
The massacre has been recognised as genocide by the International Court of Justice and the International Criminal Tribunal for the former Yugoslavia.
Serbian and Bosnian Serb politicians have long denied the extent of the killing, although two international tribunals have described the bloodshed as genocide.
Bosnians in Ireland held a commemoration in Dublin earlier this week.
