28 June 2014
Last updated at 00:12
Bosnia is set to commemorate 100 years since the assassination of Austrian Archduke Franz Ferdinand, the act that triggered World War One.
Cultural and sporting events, including a concert by the Vienna Philharmonic, will mark the occasion in Sarajevo.
Gavrilo Princip, who shot the heir to the Austro-Hungarian throne, continues to be a divisive figure in Bosnia.
The shots fired by the Bosnian Serb on 28 June 1914 sucked Europe’s great powers into four years of warfare.
Bosnia’s Serbs, Croats and Muslim Bosniaks are still divided over the role Princip played in bringing tensions to a head in Europe in 1914, with counter-commemorations planned by Bosnian Serbs.
Leaders of Serbia and some Bosnian Serbs are boycotting official events, which they say are designed to incriminate Serbs.
On Friday, Serbs in Bosnia unveiled a statue of Princip in eastern Sarajevo, seen by them as a national hero who ended years of occupation of the Balkans by the Austro-Hungarian empire.
In the eastern town of Visegrad, actors will re-enact the murder of Archduke Ferdinand and his wife, Sophie, and the Belgrade Philharmonic will play music by Vivaldi.
Austrian Archduke Franz Ferdinand and his wife Sophie were shot dead in their car by Gavrilo Princip
Bosnian Serbs are planning to open the house in Obljaj where Gavrilo Princip was born in his honour
Thousands of cyclists joined the Sarajevo International Race for Peace to mark the centenary last week
The commemorations in central Sarajevo will take on a completely different tone to those in the east of the city, says the BBC’s Guy De Launey.
The Vienna Philharmonic will play a selection harking back to Hapsburg days, including Haydn’s Emperor Quartet, he adds.
The concert is being held at the newly-restored national library, which was destroyed during the 1992 siege of the city by Bosnian Serb forces in the Bosnian War.
Austrian President Heinz Fischer will be attending the concert, which is the centrepiece of official events marking the anniversary.
Commemorations are due to close with an open-air musical memorial event in Sarajevo.
Twenty-eight European Union leaders gathered on Thursday to mark 100 years since the beginning of World War One at Ypres in Belgium.
Countdown to WW1