Bosnia's presidency on Saturday strongly condemned a stone-throwing attack by an angry mob that forced Serbian Prime Minister Aleksandar Vucic to flee a ceremony marking the 20th anniversary of the Srebrenica massacre.

The tripartite presidency "condemns in the strongest terms and voices a deep regret over today's attack," a statement said.

Praising the Serbian premier's attendance at the commemoration of the massacre of some 8,000 Bosnian Muslims males, the presidency called for a swift probe to identify the perpetrators of the attack.