The Serbian prime minister and president are to attend a ceremony in Sarajevo to unveil a statue of Gavrilo Princip, the young student who assassinated the Austro-Hungarian Archduke Franz Ferdinand.

The shooting, on 28 June 1914, provided the spark that led to the First World War.

Princip was a Serb nationalist who thought Bosnia and Serbia should be unified outside the Austro-Hungarian empire. Concerts in two Bosnian cities will also mark the 100th anniversary of the Sarajevo assassination.