Abandoned by their U.N. protectors toward the end of a 1992-95 war, 8,000 Muslim men and boys were executed by Bosnian Serb forces over five July days, their bodies dumped in pits then dug up months later and scattered in smaller graves in a systematic effort to conceal the crime. More than 1,000 victims have yet to be found.
20th Anniversary of Srebrenica Massacre, Potocari, Bosnia and Herzegovina -- July 11, 2015
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Aleksandar Vucic, Serbia's prime minister, center, is seen during a scuffle at the Potocari memorial complex near Srebrenica, 150 kilometers northeast of Sarajevo, Bosnia and Herzegovina, July 11, 2015.
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Former United States President Bill Clinton delivers a speech during a ceremony marking the 20th anniversary of the Srebrenica massacre in Potocari, near Srebrenica, Bosnia and Herzegovina, July 11, 2015.
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Former U.S. President Bill Clinton tours the former battery factory at Potocari memorial complex marking 20th anniversary of the Srebrenica massacre of Potocari, 150 kilometers northeast of Sarajevo, July 11, 2015.