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Aleksandar Vucic, Serbia's prime minister, center left under umbrella, is seen during a scuffle at the Potocari memorial complex near Srebrenica, 150 kilometers northeast of Sarajevo, Bosnia and Herzegovina, Saturday, July 11, 2015. Anger boiled over Saturday at a massive commemoration of the Srebrenica slaughter 20 years ago as people pelted Serbian Prime Minister Aleksandar Vucic with water bottles and other objects. (AP Photo/Marko Drobnjakovic)