VIDEO: Serbian PM flees Srebrenica ceremony

Serbian prime minister Aleksandar Vucic has come under attack at ceremonies marking the 20th anniversary of the massacre in the Muslim enclave of Srebrenica.

As Mr Vucic entered the cemetery to lay flowers, thousands booed and whistled.

Mr Vucic’s associate, Suzana Vasiljevic, said he was hit in the face with a stone and his glasses were broken.

File photo of Serbian prime minister Aleksandar Vucic.

Ms Vasiljevic said she was behind Mr Vucic when “masses broke the fences and turned against us”.

A group of women from Belgrade, Serbia, who for years are demanding Serbia to admit its role in the slaughter, yelled “responsibility!” and “genocide!”

Someone threw a shoe at him, others threw water bottles and other objects. The crowd eventually chased Mr Vucic away from the ceremony.

A few people carried banners with his own wartime quote: “For every killed Serb, we will kill 100 Bosniaks.”

Tens of thousands marked the 20th anniversary of Europe’s worst massacre since the Holocaust – the slaughter of 8,000 Muslims from the eastern Bosnian town of Srebrenica – with foreign dignitaries urging the international community not to allow such atrocities to happen again and to call the crime by its real name - genocide.

“I grieve that it took us so long to unify ... to stop this violence,” said Bill Clinton who was US president Bill Clinton at the time of the massacre and whose administration led the Nato airstrikes against Serb positions. This ended the Bosnian 1992-95 war and the US brokered a peace agreement.

Serbia and Bosnian Serbs deny the killings were “genocide,” but Mr Vucic came to represent his country at the commemoration.