Serbia’s PM Aleksandar Vucic has been chased away by stone-throwing protesters from a ceremony marking the 20th anniversary of the Srebrenica massacre in Bosnia-Herzegovina. About 8,000 Bosnian Muslim men and boys died at the hands of Bosnian Serb forces amid the break-up of Yugoslavia. Serbia backed the Bosnian Serbs and Mr Vucic was praised for attending the event. The Serbian foreign ministry has now issued a formal protest note to Bosnia. Bosnia’s main Muslim SDA party said the attackers had “embarrassed Bosnian Muslims”, in a statement quoted by FENA news agency. Mr Vucic is a former radical Serb nationalist who served under Serbian leader Slobodan Milosevic in the late 1990s.