Plants grow beside a wall of Petkovci dam in Bosnia and Herzegovina June 24, 2015. Between 1,000 and 1,500 people were killed at the site, 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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