A Bosnian woman mourns over the coffin of a relative during preparation for mass burial at the Potocari memorial cemetery near Srebrenica on July 11, 2010. Sunday marked 15 years since the Srebrenica massacre of nearly 8,000 Muslims by Bosnian Serbs, the darkest episode of the violent break-up of Yugoslavia. By Dimitar Dilkoff/AFP/Getty Images.