A chair stands at an abandoned battery factory in Potocari, Bosnia and Herzegovina July 1, 2015. Approximately 6,000 people were held captive at the site. The number of people who were killed at the site is unknown, but it thought to number in the dozens, according to the Missing Persons Institute of Bosnia and Herzegovina. On Saturday, Bosnia marks the 20th anniversary of Europe’s worst mass killing since World War Two - the slaughter of some 8,000 Muslim men and boys by Bosnian Serb forces during five July days in 1995. Even now, the forests and farmland around Srebrenica are yielding bones; over 1,000 victims are missing, tossed into pits then dug up months later and scattered in smaller graves by Bosnian Serb forces trying to conceal the crime. REUTERS/Dado Ruvic

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