A raging mob attacked Serbia’s prime minister Saturday during a ceremony marking the 20th anniversary of the Srebrenica massacre of about 8,000 Muslims in Bosnia — Europe’s worst atrocity since the Holocaust.

Aleksandar Vucic was hit by a rock as the masses yelled “Allahu akbar” — Arabic for “God is great” — at a monument for the slaughtered Bosnian Muslim men and boys.

“I regret that some did not recognize our sincere intention to build a sincere friendship between Serbs and Bosniaks [Muslims],” Vucic said after the attack, Agence France-Press reported. “My hand remains outstretched.”

The 1992-95 war in Bosnia — in which Orthodox Christian Serbs fought against Bosnian Muslims and Croatian Catholics — left more than 100,000 people dead.