SERBIA has demanded an investigation after Prime ­Minister Aleksandar Vucic was attacked at the 20th anniversary commemoration of the ­Srebrenica massacre in Bosnia on Saturday.

Mr Vucic was forced to flee as a crowd of protesters climbed over barricades and pelted him with stones and bottles, chanting: “Kill, kill” and “Allahu akbar.”

Bodyguards protected the prime minister with umbrellas, bags and raised arms as they rushed to an armoured vehicle.