An attack by an angry mob against Serbian Prime Minister Aleksandar Vucic during a Srebrenica massacre commemoration Saturday was the work of "sick" people, the mayor of the Bosnian town said.

"This is the work of sick minds who abused this solemn event," said Srebrenica mayor Camil Durakovic. He added that Vucic, who was forced to flee by a crowd hurling stones and plastic bottles, had "tried to show compassion with our sadness and suffering."